Sounds a lot better.What about this, now going down to the G against the C?

听起来好多了，再试试这个，往下一个音高用G音来搭配C音？

耶鲁公开课 - 聆听音乐课程节选

For example, suppose you use vertical motion and you use y instead of x; and a would be g or -g; that's a particle falling down under the affect of gravity.

例如,假设在竖直运动中,你用 y 来代替 x,那么 a 就是 g 或者 -g,这就是一个受重力作用下落的质点

耶鲁公开课 - 基础物理课程节选