1. The government has gradually toughed up regulations and penalties for car-hailing sevices.
2. College Board has increasingly toughened penalties for those who cheat in SAT test. SAT漏题作弊情况日益严重，官方加强处罚。
3. Three years in the army toughen him up./ Three years life studying abroad without parents' care toughened me up and became more independent.(很喜欢toughen的另外一个意思：“变得坚强”）
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