单词：keep a rein on
keep a rein on的用法和样例：
例句
- The rabble must be kept in a short leash.对这种下等人必须严加约束。
- I made a conscious effort to get there on time.我刻意约束自己准时到达那里。
词汇搭配
- keep a tight rein on约束
- keep a slack rein on something控制不紧
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