contribute to 有助于 under control （被）控制住 out of control 无法控制 在方便的时间或地点 at ...

面对，面临 be confronted with be brought face to face with congratulate sb on...

想象，设想 conceive of think of imagine be concerned with/about 与……有关 concern...

偶然 by chance accidentally by accident for a change 换换环境（花样）等 charge sb. ...

begin with 以……开始 （经常用于开始语）首先，第一 to begin with first of all 以……名义 on beha...

把……归因于…… 认为……是……的结果 attribute to to believe sth. to be the result of 平均 ...

对……负责 answer for undertake responsibility for be liable for take charge ...

……的可能，留有……的余地 admit of be capable of leave room for 预告，事先 in advance bef...

解释，说明 account for give an explanation or reason for 由于，因为 on account of ...