Masking
[計] 屏蔽, 掩蔽, 掩模\\n[化] 掩蔽; 隱蔽
??? 情景例句
All my bags are checked in. I guess I'm all set to go.
我的行李都檢查完了，看來我可以走了。
To sink
沉下
The train was late but nobody knew the reason for the delay.
火車晚點了，但沒人知道為什么。