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1.on the right track 做对了；走上正路了
例句：I believe that our economic development over the past few years confirms that they are on the right track.
回顾过去几年的经济发展，我相信这个方向是正确的。
2.under lock and key 妥善保管；锁起来
例句：Until then, keep your own diaries under lock and key.
在那以前，记住，把你自己的日记锁好。
3.give a sigh of relief 如释重负；松了一口气
例句：He gave a sigh of relief.
他如释重负地叹了口气。
4.wear sb out 使...累坏了
例句：Your tests really wear me out.
你的测试真是让我累坏了。
