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1·The unexpected arrival of the letter made us jump with joy.

那封信突然的到来使我们高兴得跳了起来。

2·Many who jump for joy at getting their grades may emerge from university fearful about their prospects - and much worse soon for those with triple the debts.

许多孩子以跳级为乐趣，他们可能会在大学的时候会对他们的未来感到恐惧，对那些身兼三重债务的年轻人来说情况就更糟了。