one of the soldiers said to Smith. "You'll never be able to walk all those miles with that heavy pack on your back."

VOA: special.2009.12.12

So, held back here the heavy artillery.

那么,藏在后面的是重炮

耶鲁公开课 - 聆听音乐课程节选

By late afternoon, John's legs hurt and pack on his back was very heavy.

VOA: special.2010.06.26