Love has not come, the day is carefree; the most painful, but also the test and the exam. Felt a lot of pressure, then look back, but how small.

爱情还没有来到，日子是无忧无虑的；最痛苦的，也不过是测验和考试。当时觉得很大压力，后来回望，不过是多么的微小。

youdao

Yesterday he took back the pressure test pump from machine shop.

昨天他从机厂取回了试压泵。

youdao

And water is used in cold test. Through changing operating conditions, throat area and back pressure, the change rule of discharge coefficient and pressure recovery factor were found.

通过大量冷态试验，在大范围变化工况、变化喉部面积及变化背压条件下，利用水对低温流量控制系统进行研究，得到了流量系数、压力恢复系数的变化规律。

youdao