Definition: when someone or something disappears Level: B2
警方正在讯问一名男子，这与他失踪有关。
The police are questioning a man in connection with his ___disappearance.
他失踪后，许多人搜寻了多日。
Many people searched for days after his sudden ___disappearance.
这件古代文物的消失仍然是个谜。
The ___disappearance of the ancient artifact remains a mystery.
