博物馆的标识写着‘请勿触摸展品。’

The museum sign said 'Do not ___touch the exhibits.'

她轻轻地拍了拍他的肩膀来安慰他。

She gently ___touched his shoulder to comfort him.

在拥挤的公交车上，我感觉有人碰了我的背。

I felt someone ___touch my back in the crowded bus.