1.If you peel birch bark in the winter, we call it "the winter bark", another layer, a tougher inner layer of the tree adheres to the bark, producing a stronger material.
如果你在冬天剥桦树皮，我们称它为“冬树皮”，另外一层更加坚硬的紧贴树皮的树层就可以生产出更强更硬的材料。
2.Pete Schneider considers the climb tougher today.
皮特·施耐德认为，如今的奋斗更加艰难。
3.The government is introducing tougher measures to combat crime.
政府正在推行更强硬的手段来反击犯罪。
4.Other countries are tougher.
别的国家都是强硬的。
5.The government insists that 'prison works' and plans to introduce a tougher sentencing policy for people convicted of violent crime.
政府坚持认为“关押有效”，并计划对暴力犯罪者实行更严厉的判刑政策。
6.But he is becoming a tougher opponent.
但他会成为一个更强硬的对手。
7.These Bennetts were tougher than I am.
班纳特家庭的这些人都比我坚强。
8.The tougher tone seems to be working.
更加强硬的姿态似乎正在见效。
9.The stress tests should be tougher than now planned.
应力测试应比现在的计划更严厉。