你黑夜里骑自行车的时候不看那个数字显示仅仅靠感觉能知道自己的前后档当时在哪个档次上么?

But now I know the sequence to change gears.
1/1-1/2-1/3-2/3-/2/4-3/5-3/5-3/6-3/7.

This will avoid having to change both front gear
and back gear at the same time