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A piston syringe that is fitted with a hypodermic needle for giving injections.
带有皮下注射器针头进行注射的注射器活塞。
He ordered the piston taken off the lathe and fitted to the cylinder.
他让把活塞从车床上卸下来装到汽缸上去。
These changes may act upon a diaphragm or a piston which in turn activates the valve, examples of this type of valve found commonly are safety valves fitted to hot water systems or boilers.
这些变化可能采取行动的一个膜片或活塞这反过来又激活阀门，阀门这种类型的例子，发现常见的有安全阀门安装在系统或热水锅炉。
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