1）生活中总是充满了起起落落，没有什么是一成不变的。
Life is always full of ups and downs. Nothing lasts forever.
2.
场景1：美国对的中国关税征收。
场景2：作弊现象不会持续下去。
造句：
1.America's tariffs on China are likely to last for sometime.
2. The current situation will not last long, because cheating hardly goes unnoticed.
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