while

Somebody called while you were out.

你不在的时候有人打电话来了。

She broke her arm while skiing.

她在滑雪时摔断了胳膊。

Please stand right here while I take the photo.

请站在这里，我给你拍照。

He broke his leg while playing soccer.

他在踢足球时摔断了腿。

She injured her shoulder while playing tennis.

她在打网球时肩膀受伤了。

It is necessary to wear a helmet while riding a bicycle.

骑自行车时必须戴头盔。

Please hang on while I check the schedule.

请稍等，我查一下日程。

He accidentally tore his favorite shirt while climbing the fence.

他在爬栅栏时不小心撕破了自己最喜欢的衬衫。

He tried to balance the book on his head while walking across the room.

他在穿过房间时试着把书顶在头上保持平衡。