Retene
n. [化]惹烯,1-甲基-7-異丙基菲
??? 情景例句
Is that tall or average or what?
這樣尺寸是高呢， 還是普通， 或者算怎樣？
He's studying his lesson.
他正在學習課程。
only of metal, which wears away by friction.
而是由金屬組成，而金屬可以隨著磨擦而磨損殆盡。