多吃纤维有助于保持肠道健康。

Eating more fiber helps maintain a healthy ___bowel.

探险队深入洞穴的深处寻找古代遗迹。

The explorers ventured into the ___bowels of the cave searching for ancient relics.

他悲惨的故事触动了听众的恻隐之心。

His sad story moved the ___hearts of the audience.