stomach

He had an upset stomach.

他胃部不适。

Before one of these workouts, the men skipped breakfast, meaning that they exercised on a completely empty stomach after a long overnight fest. On the other occasion, they ate a rich morning meal about two hours before they started walking.

在其中一次锻炼前，他们跳过了早餐，这意味着他们在经过漫长的一夜狂欢后，完全空腹锻炼。另一次，他们在开始行走前两小时吃了一顿丰富的早饭。

If you want to take part in the contest, it is a good idea to remember these guidelines: first, make sure your stomach is nearly empty of food.

如果你想参加比赛，记住这些指导方针会是很好的主意：首先，确保你的胃里几乎没有食物。

The children lay down on their stomachs.

孩子们俯身趴着。

On the first day of my first grade, I stood by the door with butterflies in my stomach.

上一年级的第一天，我站在门口，心里七上八下。

They also found some food that remained in this ancient animal's stomach.

他们还在这只古老动物的类胃器官里找到了食物残渣。

Modern ruminant animals have evolved more complex stomachs.

现代的反刍动物进化出了更复杂的胃。