2025年【海外移民】最新政策详解! >>
半小时之内Within half an hour.半小时之内回答Please give the answer within half an hour.
将来时的话用in half an hour过去时的话用for half an hour
45分钟等于(0.75)小时; 225千克等于(0.225)吨; 45/60 =0.75(小时) 225/1000 =0.225(吨)