英国统治诺曼底约30年,直到法国在1450年得到永久的统治权.England dominated Normandy for some 30 years until France gained permanent control in 1450....

目前，30%的爬行动物、鸟类和鱼类面临灭绝的危险。30 percent of reptiles, birds, and fish are currently threatened with extinction.去年，这个集团的纯利润率为30%。The group had a net profit margin of 30% last year.真空包装的火腿片应在食用前30分钟把包装除去。Vacuum-packed ham slice...

“30”的英语可以翻译为：thirty...