Thiophanthrene
萘并[2, 3-b]噻吩
🗣️ 情景例句
I don't know.
我也说不上来。
There was a big choice of shops in the small town.
这个小镇上有好多商店可供选择。
She goes to work every day except Sunday.
除星期天外，他每天去上班。