1. The plane 's taking off. Please fasten your seat belt.
   飞机起飞了。请系好安全带。
2. Make sure that your seat belt is securely fastened.
   请确认你的安全带系牢了。
3. Please fasten your seat belt.
   请系好你的座椅安全带。
4. Everyone is supposed to wear a seat belt in the car.
   每个坐在汽车里的人都应该系上安全带。
5. Fasten your seat belt.
   系好你的安全带

　1个名词解释