crack down upon

• 采取严厉措施

crack down upon的用法和样例：

例句

1. Our city is cracking down on hard-core criminals.
   我们市正对顽固不化的凶恶罪犯采取严厉措施。
2. My father cracked down on him at a crucial time in his life.
   我的父亲在他一生中的关键时刻对他采取了严厉措施。