名词
中文翻译：间隔环
同义词：
['spacer', 'throttle ring']
例句：
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1.The spacecraft used a spacer to regulate its speed.
航天器使用一个节流环来调节其速度。
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2. The throttle ring was designed to control the flow of fuel.
节流环被设计用来控制燃料的流动。
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3. The spacecraft's engine used a spacer to reduce vibrations.
航天器的发动机使用了节流环来减少振动。