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be busy忙着 be busy about忙于... be careful t0务必注意 be certain to一定，必然 be confident in对有信心 be clever at擅长于 be composed of由组成 be connected with与有关 be covered with被覆盖 be curious t0很想 be derived from由得到 be capable of能够 be characterized by以为特征 be combined with与结合 be concerned about关心，挂念 be coupled with与...配合 be crowded with挤满，拥塞 be dependent on/upon取决于，依赖 be determined to决心 be different from与不同 be divided into被分成 be eager to急于要 be equal to等于 be fed up厌烦 | 
