短語詞組短語be very busy with sth 忙於be busy with homework 會忙著做作業(yè);功課忙;忙著功課be busy with writing 忙於寫作be busy with sty 忙於to be busy with 忙著be busy with research 忙於研究工作be busy with sth 於某事;忙於某事;忙於;忙於做某事be busy with detail 忙於對付be busy with research work 專心於研究工作 返回 be busy with