Pentaene
[化] 五烯
??? 情景例句
John and I celebrate our fortieth anniversary next month.
下個(gè)月John和我將慶祝我們的結(jié)婚四十年紀(jì)念。
His courage is a lesson to us.
他很有勇氣，是我們大家的榜樣。
Take care!
保重！