这是由牙龈组织的特殊结构所决定的。

This is determined by the special structure of the gingival tissue determined.

youdao

有，你该记住口腔组织(牙龈)总是在变化的。

Yes. You must remember that your mouth tissues (gums) are always changing.

youdao

有，你该记住口腔组织(牙龈)总是在变化的。

Yes. You must remember that your mouth tissues (gums) are always changing.

youdao