Hdo
abbr. hydrogen-deuterium-oxygen 重水; heavy diesel oil 重柴油; half-duplex operation 半双工操作; horizontal deflection oscillator 水平偏转振荡器
🗣️ 情景例句
First, we need to more public relations activities to promote understanding.
首先，我们应该更多地做公关活动以促进了解。
It is better to wear out than to rust out.
与其锈掉，不如用坏。
Though a number of descents have been made, much of it still remains to be explored.
人们多次进入洞内探险，但至今尚有不少东西有待勘探。