这些警察戴着头盔保护自己。

These policemen wear helmets to protect themselves.

youdao

它是椭圆的，青少年在打这个球的时候要戴着头盔保护自己。

It is elliptical and the teenagers play it with wearing the helmet to protect themselves.

youdao

这些警察戴着头盔保护自己。

These policemen wear helmets to protect them.

youdao

这些警察戴着头盔保护自己。

These policemen wear helmets to protect them.

youdao