Good, the tower has been on its position, check its perpendicularity.
好了！该塔已就位了，检查一下它的垂直度。
The internal waves can propagate along the level direction and the perpendicularity one.
内波不仅可以沿着水平方向传播，而且还具有垂向传播的特性。
The internal waves can propagate along the level direction and the perpendicularity one.
内波不仅可以沿着水平方向传播，而且还具有垂向传播的特性。
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