你应该在飞机起飞之前半个小时到那。

You have to be there half an hour before departure time.

youdao

幸运的是，我们在飞机起飞之前赶到了。

Luckily, we arrived before the plane took off.

youdao

在飞机起飞之前，你一定要扣紧安全带。

You must buckle your seat belt in a plane before it takes off.

youdao

飞机起飞之前你不得抽烟。

You are not allowed to smoke until after takeoff.

youdao

我乘坐的飞机将于9：20分起飞，所以我必须在8：30之前赶到机场。

My plane is taking off at 9:20, so I must be at the airport by 8:30.

youdao

我乘坐的飞机将于9：20分起飞，所以我必须在8：30之前赶到机场。

My plane is taking off at 9:20, so I must be at the airport by 8:30.

youdao