There are three types of sag: long?term development type, early development type and late development type.

前言：凹陷可分为长期发育型、早期发育型和晚期发育型三大类别。

youdao

There are three types of sag: long? term development type, early development type and late development type.

凹陷可分为长期发育型、早期发育型和晚期发育型三大类别。

youdao

There are three types of sag: long? term development type, early development type and late development type.

凹陷可分为长期发育型、早期发育型和晚期发育型三大类别。

youdao