英语语法分析

If you do, and must return your good wishes and happy operculum laugh!

如果你做到了，回报你的一定是美好的祝愿，幸福的笑厣！

Teeth covered by an operculum can be difficult to clean with a toothbrush.

被盲袋覆盖的牙齿很难用牙刷清理。

The contact between the operculum and the shell appears to be uneven but not indented.

卵盖与卵壳连接处虽不很整齐，但并不呈锯齿状。