D2o
[医] 氧化氘, 重水
🗣️ 情景例句
Right.
好的。
What is done by night appears by day.
若要人不知，除非己莫为。
He noticed at once that discipline was slack: the Danes had the self-confidence of conquerors, and their security precautions were casual.
他马上发现丹麦军纪律松弛，他们以征服者自居，安全措施马马虎虎。