be busy doing sth 忙于做某事 ; 忙于 ; 忙于干某事 ; 忙于做
playing be busy doing sth 忙于做某事
be busy doing sth sth 忙于
doing be busy doing sth 忙于干某事
be busy in doing sth 忙于做某事
be kept busy doing sth 被迫忙于
be e busy doing sth 忙于
Her mother is busy cooking in the kitchen. be busy doing sth.
忙着做某事（她的母亲正在厨房忙着做饭。）
youdao
Be busy doing sth.
的意思都是“忙于做某事”。
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