Biodegraded
vt. 生物递降分解（biodegrade的过去式与过去分词形式）
🗣️ 情景例句
have become good friends, haven't you?
成了好朋友，不是吗？
By the way,who are you waiting for?
顺便说,你正在等谁？
I wish I had followed your advice.
我真希望我采纳了你的建议。