tummy

1. N-COUNT Your tummy is the part of the front of your body below your waist. Tummy is often used by children or by adults talking to children. 肚子 (儿童化用语)

Your baby's tummy should feel warm, but not hot. 你宝宝的肚子摸起来应该是温的，而不是热的。

2. N-COUNT You can use tummy to refer to the parts inside your body where food is digested. Tummy is often used by children or by adults talking to children. 胃 (儿童化用语)

I've got a sore tummy. 我胃痛。

...a tummy ache. …胃痛。