1. 释义：to become more strict, or to make something more strict
例句：The new law toughens (up) penalties and restrictions for DUI offenders.
2. 例句
中国已经加强了对虚拟货币交易的控制。
Chinese authorities have toughened their control of cryptocurrency trading.
政府已经出台了新政策，加强电动车使用的规定。
The government has issued new policies to toughen the rules about using electric scooters.
3. 翻译
政府逐渐加强了对网约车的管制和处罚。
The government has gradually toughened the regulation and penalties on car-hailing services.
