Question

谁可以帮我翻译下下面的句子,用上括号里的词,谢谢.

等他到机场时，飞机已经起飞了。（by the time）
在校园里，车速被限制在每小时30英里。（be limited to）
这对双胞胎之间的不同在于：一个依赖父母，另一个却很自立。（on one`own）
一方面汽车有用，可另一方面它们也造成污染。（on the one hand…on the other hand）

Answer 1

等他到机场时，飞机已经起飞了。（by the time）
By the time he reached the airport, the airplane had already took off.

在校园里，车速被限制在每小时30英里。（be limited to）
In the campus, the vehicle speed is limited to each hour 30 miles.

这对双胞胎之间的不同在于：一个依赖父母，另一个却很自立。（on one`own）
This lies in differently to the twin between: one relye on their parents, another is on one's own.

一方面汽车有用，可另一方面它们也造成污染。（on the one hand…on the other hand）
On the one hand the automobile is useful, on the other hand but they also cause the pollution.

Answer 2

By the time he arrived the airplane had taken off.

In the campus, the vehicle speed is limited to 30 miles per hour.

The differece of this twins is: one is depended on their parents, the other is on his or her own.

On the one hand, the car is useful; on the other hand, they also bring about pollution.