still tube

例句：

1. 1. The still tubeis used to collect samples from the air.
   静止管用于从空气中收集样本。
2. 2. Thescientist used a still tube to analyze thechemical composition of the sample.
   科学家使用一个静止管来分析样本的化学成分。
3. 3. Thestill tube was crucial in the process ofseparating the oil and gas.
   静止管在分离石油和天然气的过程中至关重要。