Bifuran
双环呋喃
🗣️ 情景例句
You work hard on all your committees,
而你总是在各种委员会里忙，
We know not what is good until we have lost it.
有的时候不爱惜，失了以后空叹息。
For one thing they keep the water clean.
一来，水下植物可以保持水的清洁。