The paper makes an analysis of the results of wind Tunnel tests on the ball model with hollow base.
本文给出了底凹弹丸模型风洞实验结果的分析。
The squirrel disappeared into a hollow at the base of the tree.
松鼠钻进了树根处的一个洞。
A cylinder (Fig. 1) is a hollow tube with a closed concave base that permits the cylinder to stand upright.
钢瓶(图1)是中空的管道，封闭的底部是凹入的，这样可以直立起来。
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