英语语法分析

The hematoma located in the narrow diastema;

血肿位于狭窄的腔隙内；

If the diastema is too big, the size harmony is important. A small artificial tooth added in the diastema is not good.

如果缝隙太宽，要注意大小协调，中间加一小塑料牙是不良设计。