Dohc
abbr. 双顶置凸轮轴（Double Overhead Camshaft）
🗣️ 情景例句
If only Robbie and Alexandra were here.
要是Robbie和Alexandra在这儿多好。
Is anybody home?
有人在家吗？
it would be up and down, to and for and from side to side.
呈现出上上下下、来来回回、左左右右3种性质的运动。