我个人的理解是
waiting charge 就是下一个缸的火花塞
required instant 就是确定的点火时间
不知道这样对不对 大家轻拍 班门弄斧头了：）

【 在 boyue (蛰伏◎相信自己要果敢) 的大作中提到: 】
: in the gasoline engine the source of the heat for igniting the charge, namely,
: an electric spark, is generated outside the engine, and is taken, as it were,
: into the waiting charge at the required instant.
: ...................
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