在河流入口处保护三角洲的堤岸也处于危险之中。
Levees protecting the delta at the mouth of the river are in bad shape, too.
被轻金属结构保护的主入口也在这里。
The main entry it's also here, which is protected by a light metalic structure.
方法：将橡皮障置入口腔内保护牙龈。
Methods: a rubber dam was placed over the teeth to protect the gum.
方法：将橡皮障置入口腔内保护牙龈。
Methods: a rubber dam was placed over the teeth to protect the gum.
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