fluidic element

例句：

1. 1. The liquid flowed through the tubeeasily.
   液体很容易地流过管子。
2. 2. Thefluid is essential for the operation of themachine.
   这种流体对机器的运行至关重要。
3. 3.The researchers used a fluid to dissolvethe sample.
   研究人员使用一种流体来溶解样本。