··各位··第一句是Can they be exchanged (for each other)?好不·····第二局What's the difference of the conditions where they are used?··第三局Under which condition can they be used?后两句不一定对···一楼是机器翻译的··二楼··不懂··
Could they be switched or swapped?They have different applications, so what are the differences?
orWhat are the application differences.Fro what could they be applie
