toughen:to make something more strict

toughen后多加rule,law,regulation,policy,penalty,punishment,restriction或control

The new law toughens (up) penalties and restrictions for DUI offenders.

Chinese authorities have toughened their control of cryptocurrency trading.

The government has issued new policies to toughen the rules about using electric scooters.

The new law toughens up penalties and restrictions for DUI offenders.

Mr Trump and his administration have got three things right. The first is that America needs to be strong. It has toughened the rules on takeovers, to give more right to national security.

DUI :Driving under the influence

elctronic scooter:电动车

翻译：

政府逐渐加强了对网约车的管制和处罚。

The government has gradually toughened regulations and punishments on online car-hailing services.

（参考翻译：The government has gradually toughened regulations and punishments on car-hailing services.）

活学活用:

Talks are under way to toughen trade restrictions.

They have put considerable pressure on the Government to toughen its stance.

British regulations are also being toughened.