adj.下沉的
n.下沉；凹陷；虛脫感
動詞sink的現在分詞形式.
When they didn't get back by midnight, I got that sinking feeling. 他們到半夜時還沒回來，我感到心神不定。
He could not control the sinking of his legs. 他無法控制他的腿的下沉。
