英语语法分析

To grasp histopathological feature of marginal gingivitis and gingiva hyperplasia.

了解边缘性龈炎及龈增生的组织病理特点。

The attached gingiva is the part of gingival tissues that is continuous with the marginal gingiva.

所附的牙龈是牙龈组织的一部分，这是连续的边缘牙龈。

Methods: 63 anterior abutment free gingiva were observed with naked eye before and after restoration.

方法：肉眼观察63颗前牙在修复前后游离龈的色泽变化。