The people at the party were worried about Janet because no one was aware of where she had gone.
参加聚会的人们都为珍妮物担心,因为没人知道她去哪里了。
When there is no one in the office, you can leave the answering machine on so that people who call you up can leave a message.
当无人在办公室时,你可以打开留言机,这样打电话给你的人就可以留言了。