It is very important to measure liquid density in cryogenic liquid rocket engine test.

在低温液体火箭发动机的试验中，对液体密度的测量是很重要的。

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A complex lab calculation process is needed to test the surface tension of the liquid.

溶液表面张力的测定需要一个复杂的实验测量计算过程。

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Then she poured the liquid out of the bottle into a test tube.

然后她把液体从瓶子里倒进一个试管。

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Then she poured the liquid out of the bottle into a test tube.

然后她把液体从瓶子里倒进一个试管。

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