重点讲解：
1. a bunch of 一伙，一群（人）；
例句：A bunch of children were at play.
一群孩子在玩Wa0,[bYKWrQCOs7lNmGB。
2. save up 储蓄；积攒；攒钱；
例句：People often put money aside in order to save up enough to make one major expenditure.
人们常常为了一笔大的开销而存钱TK0[HCj8!pFce=Gt1G。
3. end up 最终；结果；到头来；
例句：Wasteful people usually end up in debt.
挥霍浪费者最后往往负债!B=,ue2)qVyc。
4. be used to sth./going sth. 习惯于；
例句：She is not used to the new environment.
她对新环境不习惯HH!Lnlh%@H*0W37xo。