tummy

Compared meaning: the organ that digests food (noun).

比较义项：胃，腹部（名词）。

• stomach

  The neutral, all-purpose word for this organ; used in everyday, medical, and formal contexts alike, with no particular register restriction.

  这是指该器官的中性、通用说法，在日常、医学和正式场合都可以使用，没有特定的语域限制。

  The doctor said an empty stomach can make the medicine harder to absorb.

  医生说空腹可能会让药物更难吸收。

• tummy 本词

  An informal, childish word, typically used by or with young children, or in casual, affectionate speech; sounds odd in medical or formal contexts.

  这是一个口语化、儿童化的词，通常是儿童使用，或大人对儿童说话时使用，也用于随意、亲昵的口语中；用在医学或正式场合会显得不自然。

  Does your tummy hurt, sweetie? Let's get you some warm water.

  宝贝，你肚子疼吗？我们给你喝点温水吧。

Stomach and tummy both name the organ that digests food. Stomach is the neutral, all-purpose word, used in everyday, medical, and formal contexts alike. Tummy is informal and childish, used by or with young children, or in casual speech, and sounds odd in formal writing.

两词都指人体消化食物的器官——胃，但 tummy 是口语化、儿童化的说法，语气更轻松随意；stomach 是中性、通用的说法，正式和非正式场合都能用。