Semibenzene
半苯, 对二烷基亚甲基环己二烯
🗣️ 情景例句
When will the delivery be possible?
可以在什么时候交货？
How have you been these years?
这些年你怎么样？
Fortunately, however, ancient men made tools of stone, especially flint,
然而， 幸运的是，远古人用石头制作了工具，特别是用燧石，