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【thrifty】
还原：thrift→thrifty
例句：
1.Memories of hard years made the old woman excessively thrifty.
早年艰苦生活的回忆使这个妇人极度俭省。
2.The thrifty man sets aside some money each month for a rainy day.
节俭的人每个月为了下雨天预留一些钱。
【bounce】
英英：move up and down repeatedly
例句：
1.If you drop it, it will bounce back.
如果你把它扔掉，它将弹回来。
2.Perhaps birth rates will bounce back.
或许出生率会反弹。
3.How much damage can a famous brand take and still bounce back?
一个品牌能够经受多大的危机，之后仍能东山再起呢?
短语：
bounce back 反弹;迅速恢复活力
bounce off 弹开，反弹
bounce up and down 上下弹跳
