造句：
1.The eyes are often retracted from dehydration .
眼睛常因脱水而凹陷。
2.It forms a major structural depression .
它构成一个大的构造凹陷。
3.This india, the primal, has been depressed .
原始的古印度却凹陷下去了。
4.Recessing the oxidizer tube improves stability .
氧化剂管的凹陷使稳定性增强。
5.His cheeks were sunken and his cheek-bones prominent .
他脸颊凹陷，颧骨突出。
6.Both were growing hollow-eyed .
双方都变得眼睛凹陷了。
7.The river hollows its bank .
河岸因流水而凹陷。
8.Her eyes were a little hollow, and reddish about the rims .
她的眼睛微微凹陷，眼眶有些发红。
9.You will become sallow and hollow-cheeked, and dull-eyed .
你会变得面如土色、两颊凹陷、眼光迟滞。
10.Once the concavity was filled further growth could not take place .
一旦凹陷填满，就不可能继续生长。
基本解释：凹陷，多用于形容某一点比周围的支撑力小而造成周围高中间低的局面