water-entry cavity 入水空泡
The initial cavity, ballistic trajectory and velocity attenuation of the sphere pellets are similar at different water-entry angles and initial velocities.
在一定的入水角与速度范围内，球形弹丸入水初期弹道的空泡特性、弹道轨迹以及速度衰减规律具有一定的相似性。
It comprises the pressure boosting structure, oil entry, compression cavity and oil exhaust channel.
该泵包括增压机构，吸油油路，压缩腔，排油油路。
We everyday at brush teeth, but, because of our country mouth cavity health the education still is placed in the stage in entry-level, the most people dids not control to brush teeth rightly method.
请帮我翻译一下这篇文章谢谢我们每天都在刷牙，但是，由于我国口腔健康教育还处于初级阶段，大多数人并没有掌握正确的刷牙方法。
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