be at work

• 正在工作, 正在起作用

be at work的用法和样例：

例句

1. Unknownforces were at work to overthrow the government.
   有些尚未查明的势力正在活动图谋推翻政府。
2. Please phone the office and tell them I won't be at work today because I'm feeling out of sorts.
   请打电话给办公室，告诉他们我因为身体不太舒服，所以今天我不去上班。