Diradical
[医]双自由基, 双游离基
🗣️ 情景例句
Oh, good.
噢， 好了。
Hedges have eyes, and walls have ears.
篱笆有眼，隔墙有耳。
But the historian attempting to reconstruct the distant past is always faced with a difficult task.
但是，历史学家企图重现遥远的过去可是一项艰巨的任务，