Trifyl
三氟甲磺酰基
🗣️ 情景例句
I have been a poor student of foreign languages.
外语就学得不好。
In the fall, the boys prune the trees.
在秋天，男孩们便修剪那些树木。
She's been there for two months. She's been there since September.
她进校有两个月了。她自9月份起便在那儿学习了。