In the middle of their bodies on both the top and bottom, are button-shaped disks.

在牠们身体顶部和底部的中央，是钮扣状的吸盘。

youdao

Ideally, you want it at the top, in the middle, and at the bottom.

最理想的，你要它在顶部，在中间，并在底部。

youdao

Ideally, you want it at the top, in the middle, and at the bottom.

最理想的，你要它在顶部，在中间，并在底部。

youdao