In the 1760s, James Watt perfected a separate condenser for the steam, so that the cylinder did not have to be cooled at every stroke; then he devised a way to make the piston turn a wheel and thus convert reciprocating (back and forth) motion into rotary motion. — 18世纪60年代,詹姆斯·瓦特完善了分离的蒸汽冷凝器,因此不必每一冲程后都要冷却气缸;随后,他又发明了一种新的方法,使得活塞可以旋转运动,即从原来的(前后)往复运动演变成为旋转运动。 ① condenser /kənˈdensər/ n. 冷凝器 ② cylinder /ˈsɪlɪndər/ n. 圆柱体;汽缸 ③ reciprocate /rɪˈsɪprəkeɪt/ v. 回报;(机器)往复运动

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