自20年前孩子在公园走丢以来，这对父母就失去了孩子的音信。
The parents have lost track of their child since the kid got lost in the park 20 years ago.
这样的话，如果有人告诉你说你的父母受伤了或在医院让你跟他们走，你可以问他们那个密码词。
This way, if anyone tells you that you need to come with them because your parents were hurt or are in the hospital, you can ask them for the code word.
随着过去的考生长大成为父母，他们的孩子现在也走同一条道路。
As past exam takers grow up to become parents, their children are now taking the same path.
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