留下了20名骨干人员。A skeleton staff of 20 is being kept on.20公里后她因胃痛而退出了比赛。She dropped out after 20 kilometres with stomach trouble.这家俱乐部在过去20年间知名度大增。This club has grown in stature over the last 20 years....

“20”的英语可以翻译为：二十，twenty...