They copy the real function or duties of the human stomach and intestine, moving when breaking down food.

它们能模仿人体胃部和小肠的实际功能，在消化食物时蠕动。

And another one is to make sure that the character has a real utility, a real function.

另一个是确保角色具有真正的实用性，真正的功能。

Trim is what we would call a " decorative item" – that is, it doesn't serve any real function other than making things look a little prettier.

Trim 就是我们所说的“装饰品” ——也就是说，除了让东西看起来更漂亮之外， 它没有任何实际功能。