VERB
加强，强化（政策、规章或惩罚）；使强硬
If a person, institution, or law toughens its policies, regulations, or punishments, it makes them firmer or stricter.
例句
Talks are under way to toughen trade restrictions...
加强贸易限制的会谈正在进行中。
They have put considerable pressure on the Government to toughen its stance…
他们已对政府施加了相当大的压力，要求其采取强硬立场。