It is a good thing, have lost one day, then deep memory, also have forgotten one day.
再好的东西，都有失去的一天，再深的记忆，也有淡忘的一天。
youdao
Lost the way is also get a good thing.
迷失的路也得到了好东西。
A good thing is known when it is lost.
好东西没有了才知道可贵。
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