final 修饰变量时，初衷是告诉编译器：这个变量生而不变，可以可劲儿优化

缓存技术蕴含的是空间换时间的思想；压缩体现的是时间换空间的思想；分布式思想也最初体现在 CPU 的设计和实现上

普通磁盘的寻道时间是 10ms 左右，而相比于磁盘寻道花费的时间，CPU 执行指令和内存寻址的时间都在是 ns（纳秒）级别，从千兆网卡上读取数据的时间是在μs（微秒）级别

某些层次负责的是对下层不同实现的抽象，从而对上层屏蔽实现细节。比方说 VFS 对上层（系统调用层）来说提供了统一的调用接口，同时对下层中不同的文件系统规约了实现模型，当新增一种文件系统实现的时候，只需要按照这种模型来设计，就可以无缝插入到 Linux 文件系统中

分层架构可以让我们更容易做横向扩展。如果系统没有分层，当流量增加时我们需要针对整体系统来做扩展。但是，如果我们按照上面提到的三层架构将系统分层后，那么我们就可以针对具体的问题来做细致的扩展

分层架构需要考虑的另一个因素，是层次之间一定是相邻层互相依赖，数据的流转也只能在相邻的两层之间流转

Happens-Before 并不是说前面一个操作发生在后续操作的前面，它真正要表达的是：前面一个操作的结果对后续操作是可见的

导致可见性的原因是缓存，导致有序性的原因是编译优化，那解决可见性、有序性最直接的办法就是禁用缓存和编译优化

Java 内存模型在 1.5 版本对 volatile 语义进行了增强。怎么增强的呢？答案是一项 Happens-Before 规则

Java 内存模型规范了 JVM 如何提供按需禁用缓存和编译优化的方法

“同一时刻只有一个线程执行”这个条件非常重要，我们称之为互斥。如果我们能够保证对共享变量的修改是互斥的，那么，无论是单核 CPU 还是多核 CPU，就都能保证原子性了。

一个或者多个操作在 CPU 执行的过程中不被中断的特性，称为“原子性”

使用 watch 选项允许我们执行异步操作 (访问一个 API)，限制我们执行该操作的频率，并在我们得到最终结果前，设置中间状态。这些都是计算属性无法做到的

如果 <navigation-link> 没有包含一个 <slot> 元素，则该组件起始标签和结束标签之间的任何内容都会被抛弃。

计算属性是基于它们的响应式依赖进行缓存的。只在相关响应式依赖发生改变时它们才会重新求值。这就意味着只要 message 还没有发生改变，多次访问 reversedMessage 计算属性会立即返回之前的计算结果，而不必再次执行函数

组件是可复用的 Vue 实例，所以它们与 new Vue 接收相同的选项，例如 data、computed、watch、methods 以及生命周期钩子等。仅有的例外是像 el 这样根实例特有的选项

I have long been of the opinion that if work were such a splendid thing the rich would have kept more of it for themselves.

When the government mandates that everyone must buy a product, its sellers can, and will, increase its price, potentially without limit.

You still get these waves of doubt that come over you, for example, when you get a bad review or you accept a part and think, 'Oh, God, what have I just accepted? I can't do that.' I don't think that's something that will ever go away in me.

She felt like a chess player who, by the clever handling of his pieces, sees the game taking the course intended. Her eyes were bright and tender with a smile as they glanced up into his; and her lips looked hungry for the kiss which they invited.

I'm not prepared for holding office any more than I think Arnold is.

As content creators, we're benefitting YouTube every day. YouTube couldn't do what they do without us, so do not underestimate your power.

Let no man pull you low enough to hate him.

I love collecting market stuff in Mexico. I have an etagere built onto the wall of my living room, which has cubicles that are lit and filled with super inexpensive pottery. You see them in a new way; they become museum pieces.

That some are poorer than others, ever was and ever will be: And that many are naturally querulous and envious, is an Evil as old as the World.

I think the way we think about cancer, the way we treat cancer, has dramatically changed in the last century. There is an enormous amount of options that a physician can provide today, right down from curing patients, treating patients or providing patients with psychic solace or pain relief.

I think it's really important to realize that small businesses are often the portal for immigrants into the New York City economy. I think we have something like 40,000 small businesses that are immigrant-run in New York.

I now need to take a very aggressive approach to having a baby.

When I begin to eliminate from the list all those professions which are impossible from a financial point of view and then those which I feel disinclined to - it leaves nothing.

Usually, you can figure out where a person's mistakes came from if you ask them the genesis of their thought process: 'Why did you do it this way?' As opposed to telling them they did it the wrong way. Understanding their thought process will ultimately help you be able to communicate with them and navigate around them.

Everything that's going on within the peloton - there's about ten different races going on. There is also a survival element to it - I love the fact that it's so epic. You crash on a bike, the first thing you do is try and get back up on it. No whinging!

I remember someone once asked Jack Kennedy why he was paying such close attention to the renovation of the square across from the White House, and he said, 'It may be the only thing my presidency is remembered for.'

In Singapore, Malcolm X type of activity would be extremely difficult because the government can be very harsh on lawbreakers.

If your not practicing, somebody else is, somewhere, and he'll be ready to take your job.

Well, I don't think characters change. I think they become more revealed. I don't think you really can change a character on a show.

I'm a harsh critic of the status quo.

I can't watch 'Glee' because I get so jealous that I'm not there with them doing it that I can't even watch.

Pocketknives are kind of drifting out of our cultural consciousness, which I think is a terrible thing.

If you're raised Methodist, Catholicism is a bit of a workout. It's sort of like you're up, you're down, you're up, you're down. It's a continual hokey-pokey.

Fierce eagles breed not the tender dove.