It is a symmetrical piercing with an equal number of holes on each side.

背部每侧有对称的相同数量的穿孔洞。

youdao

Since this is an even number of holes, a parity hole would be added.

因为这是一个偶数的孔，孔平价将增加。

youdao

Two is difficult to foam, easy to produce a large number of holes between the tube holes.

二是发泡难度大，管孔之间极易产生大量空洞。

youdao

To do that, you need to look at the signal just after it has been created, when its size bears some relation to the number of holes that started it.

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Marine scientists measure its abundance by dragging a sledge equipped with video cameras along the seabed and counting the number of holes (a well-maintained burrow being the sign of a happy prawn).

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