In fact, the typical toddler averages about four ear aches per year.

实际上，大部分幼童每年平均有四次耳痛。

Stomach ache. It means generally some kind of pain. Stomach ache, ear ache, tooth ache.

腹痛。 这通常意味着某种痛苦。 肚子疼，耳朵疼，牙疼。