他的志向是成为一名科学家，为此他每天都在努力学习。

His ___aspiration to become a scientist drives him to study hard every day.

医生在病人吸气时注意到一个明显的声音。

The doctor noticed a distinct sound during the patient's ___aspiration.

英语中，字母't'在单词开头时通常需要送气发音。

In English, the letter 't' at the beginning of a word usually requires clear ___aspiration.