vi.消失；不见；失踪
The sun disappeared behind a cloud. 太阳消失在一片云后面。
Many beautiful fish are fast disappearing because of the severe pollution. 因为污染严重，许多美丽的鱼类正在面临绝种。
My wallet has disappeared from the table. 我放在桌子上的钱包不见了。
I saw her step the street and disappear into the post-office. 我看见她在街上步行，进了邮局就不见了。
