Definition: to become impossible to see Level: B1
太阳消失在一片云后面。
The sun ___disappeared behind a cloud.
我们找她，但她已经消失在人群中。
We looked for her but she had ___disappeared into the crowd.
他们看到我母亲的影子在楼梯上，然后消失了。
They saw my mother's shadow on the stairs and ___disappeared.
