英语翻译Early in the century,a pump hadcome into use in which expanding steam raised a piston in a cylinder,andatmospheric pressure brought it down again when the steam condensed inside thecylinder to form a vacuum．

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英语翻译Early in the century,a pump hadcome into use in which expanding steam raised a piston in a cylinder,andatmospheric pressure brought it down again when the steam condensed inside thecylinder to form a vacuum．
英语翻译
Early in the century,a pump had
come into use in which expanding steam raised a piston in a cylinder,and
atmospheric pressure brought it down again when the steam condensed inside the
cylinder to form a vacuum．

英语翻译Early in the century,a pump hadcome into use in which expanding steam raised a piston in a cylinder,andatmospheric pressure brought it down again when the steam condensed inside thecylinder to form a vacuum．
时间状语: Early in the century,

主语:a pump + 谓语:had come into use

从in which .句末: 定语从句修饰use

in which =in use 在使用中

定从中含有一个并列句:

分句1: expanding steam(主语)+ raised a piston in a cylinder,

分句2: and atmospheric pressure brought it down again

+时间状语从句: when the steam inside the cylinder to form a vacuum．

句意: 在本世纪初, 水泵已投入使用.在使用过程中,膨胀的水汽使汽缸里的活塞上升；

而当汽缸里的水汽变得稠密时,大气的压强又使活塞下降,从而形成真空.

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Early in the century,（时间状语，翻译这个世纪早期） a pump had come into use 泵早被使用了（是主句）in which expanding steam raised a piston in a cylinder,膨胀的气体在汽缸中上升一个活塞 and atmospheric pressure brought it down again 而且大气压又使其下降 when the steam condensed inside the cylinder to form a vacuum．当气体在气缸内压缩形成真空的时候。（时间状语从句）（in which ... 定语从句,修饰pump)
本世纪世纪初期，泵已投入使用，当气体在气缸内压缩形成真空的时候，泵里膨胀的气体在汽缸中会上升一个活塞而且大气压又会使其下降。

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本世纪早期，泵开始使用，膨胀的蒸汽在汽缸中抬升一个活塞，当蒸汽在汽缸中冷凝时气压又将活塞压下来，从而形成气缸内真空。
Early in the century 时间状语
a pump had come into use 主句
in which... 定语从句，形容pump的工作原理

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