做另一件事的同时(悄悄)注意
have one eye / half an eye on sth
做另一件事的同时(悄悄)注意
to look at or watch sth while doing sth else, especially in a secret way so that other people do not notice
During his talk, most of the delegates had one eye on the clock.他讲话时大部分代表边听边悄悄看钟。
释义来自《牛津高阶英汉双解词典》第 9 版