missing

不见的、遗失的、找不到的

Two books are missing from the shelf on the top floor.

顶楼书架上少了两本书。

失踪的、下落不明的多指人

Three hikers are still missing after the heavy storm.

暴风雨过后，仍有三名登山者下落不明。

缺少的、欠缺的、缺失的

This jigsaw puzzle has a missing piece in the corner.

这幅拼图角落缺了一块。

失踪、不见go missing

Her passport went missing somewhere between the hotel and the airport.

她的护照在饭店到机场之间不知去哪了。