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1·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》

2·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。

3·Nevertheless, researchers have discovered that a process long known to discolor and toughen foods may also contribute to age related impairment of both cells and tissues.

然而，研究人员发现，一个长期以来众所周知的使食物变色和变硬的过程也可能与年龄相关的细胞和组织损伤有关。

4·This experience will toughen her.

这次经历会让他变坚韧。

5·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。

6·Best of toughen time is at the afternoon.

最好的锻炼时间是在下午。

7·My father tried to teach me to toughen up.

我父亲试图教我变得坚强。

8·His parents sent him away to school to toughen him up.

他的父母把他送到学校经受锻炼。

9·But if you're going to work in Brooklyn, you got to toughen up.

但如果你想在布鲁克林工作，就得坚强起来。

10·Before you start packing up what's left it's time to toughen up.

在你开始打包剩余物品时，你得更严格地把关。

增韧

1·The results indicated that using nano-silica can toughen and reinforce PVC effectively, so the study and application of it have a bright prospect.

这说明利用纳米二氧化硅能够有效地增强增韧pvc，其研究和应用具有美好的前景。

2·One kind of hydroxyl - terminated aliphatic polycarbonate, i. e. poly(ethylene ether carbonate) diol(PEECD) was synthesized and used to toughen epoxy resin (EP) .

合成了以羟基封端的脂肪族聚碳酸酯-聚乙基醚碳酸酯二醇（PEECD），并用于环氧（EP）树脂的增韧。

3·The rubber crumb modified by heavy oil and styrene copolymer was used to toughen waste PP.

用“重油”与苯乙烯共聚改性胶粉增韧废PP。

4·Styrene-butadiene-styrene block copolymer(SBS)modified with organic montmorillonite(OMMT)was utilized to toughen polypropylene(PP)in this paper.

采用纳米有机蒙脱土（OMMT）改性的苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）增韧聚丙烯（PP）。

(1)toughen up困难，使强壮