Under these flaps there are some folds of red flesh.

这两个盖子里面有几层红色的肌肉, 这就是鱼鳃。

Can you feel under your skin the lumps of firm red flesh which are called muscles?

你能否感觉到皮肤下方名为肌肉的红色肉块?

She cut into it, revealing bright red flesh.

她切开它，露出鲜红的肉。