第1个回答 2012-03-28
We are advancing at the speed of 50 miles an hour.本回答被提问者采纳
第2个回答 2012-03-28
We go ahead at the rate of 50 miles an hour
第3个回答 2012-03-28
we move on at a speed of 50 miles per hour
第4个回答 2012-03-28
we go forward with 50 miles per hour.