To get the full benefit of your helmet, keep your helmet fastened at all times.

所以为了发挥头盔的充分作用，请在任何时候都系上头盔颚带。

youdao

To get the full benefit of your helmet, keep your helmet fastened at all times.

所以为了发挥头盔的充分作用，请在任何时候都系上头盔颚带。

youdao