The clock at the school rings at three-thirty p.m.
在下午3点半学校的时钟响起。
2
Northrop Grumman and EADS based their tanker on the Airbus A-Three-Thirty.
诺斯罗普·格鲁门公司和欧洲宇航防务集团在空中客车A330的基础上制造了自己的加油机。
3
Writing in the last year of his life, he expressed the opinion that in two or three respects his mind had changed during the preceding twenty or thirty years.