When food digests or when you digest it, it passes through your body to your stomach. Your stomach removes the substances that your body needs and gets rid of the rest. 消化
verb [vt. 及物动词]理解,领悟;消化
Do not undertake strenuous exercise for a few hours after a meal to allow food to digest. 饭后几小时内不要做剧烈运动,以让食物消化。