30 percent of reptiles, birds, and fish are currently threatened with extinction.目前，30%的爬行动物、鸟类和鱼类面临灭绝的危险。All reptiles have to slough their skin to grow.所有爬行动物生长过程中都要蜕皮。Snakes and crocodiles are both reptiles.蛇和鳄鱼都是爬行动物....
James Gregory gave in in his " Geometriae Pars Universalis " a method of rectifying curves.JamesGregory在他的《几何的通用部分 》 中给出了计算曲线长度的方法.The dangerous type chronic otitis media occurs with pars flaccida and marginal perforatio...
A contented mind is a continualperpetual feast.知足常乐He may well be contented who need neither borrow nor flatter.不需奉承不借钱,知足常乐赛神仙。He won't be contented until he's upset everyone in the office.不把办公室里的每个人弄得心烦意乱他就不会...