重點講解：
1. back and forth 來回；往返；
例句：I could see the branches of the trees moving back and forth.
我能看到樹枝來回搖擺mIgDlpR^Eo!3LtbA7。
2. over and over again 一再；再三；反復；
例句：This is what she has been saying over and over again--I don't know how many times.
這種話，她翻來覆去不知說過多少遍了5ZN7y9M;u(c)Lkr4XP。
3. make sense 可以理解；講得通；
例句：It all makes sense now.
現在就都講得通了r;Y6W~T4bd*+VX。
4. one by one 逐個地；依次地；
例句：The students entered the classroom one by one.
學生們一個挨一個地走進教室0Y0]CVYqiNsN!*1Ey7。
5. in other words 換言之；換句話說；也就是說；
例句：In other words, we have to build different corporate cultures and ways of working.
換句話說，我們必須建立不同的企業文化和運作方式-Z2p];+=SEJI|。