Talks are under way to toughen trade restrictions.

加强贸易限制的会谈正在进行中。

《柯林斯英汉双解大词典》

They jab tree trunks to toughen their hands and practice squatting with other students sitting on their shoulders to build the leg strength.

他们猛击树干来锻炼双手，练习蹲坐，让其他同学坐在他们的肩膀上锻炼腿部力量。

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It is not too late for him to toughen up.

现在采取强硬的措施尚未为时过晚。

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In SERE training military personnel are subjected to many of the same techniques to toughen them up for possible capture by an enemy - and Ritz says SERE trainers were imported to the Guantanamo Bay detention facility.

VOA: standard.2009.04.17

However,he said Washington needs to go further and toughen its stance or risk ruining the peace process.

VOA: standard.2009.11.18

Maybe young women are afraid of being rejected, but they have to toughen up.

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Mr Brown will also ruffle business feathers with his plans to toughen-up competition law.

BBC: Tories snub CBI dinner

Heavy-equipment manufacturer Caterpillar is eager to learn how to toughen up its bulldozers and tractors.

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