The results indicated that in the two-blade impeller, the fluid mainly flowed along the suction side, the velocity is very small on the pressure side, and a typical jet-wake flow has been observed.

由测量结果可知：在双叶片叶轮内，流体基本沿叶片吸力面流动，叶片压力面上的相对速度较低，在压力面出口出现了速度很低的回流区，有明显“射流-尾迹”特征。

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The best-known ones, DeCoursey says, are circadian or daily rhythms such as the sleep-wake rhythm, daily activity rhythms, or jet lag and shift-work maladies.

最被熟知的，德库西说，是生理的或昼夜节律像睡眠-清醒节律、每日活动节律、或者乘坐飞机旅行的时差感和轮班工作病。

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The jet leaves contrails in its wake due to the temperature difference between the hot engine exhaust and the cold air.

这架喷气式飞机飞行时留下的凝结尾是由于其发动机与冷空气之间的温差造成的。

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