首先，运用拇指跳指法弹奏整支乐曲，不难发现，巴赫设置了一个拇指交叉的最大值，这样我们就有充足的机会来练习他们——显然，这是一个匠心独运的构想。

First, play the entire piece using to. Note that Bach inserted a maximum number of thumb crossings so that we have plenty of chances to practice them - obviously an intentional construct.

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压力是运用拇指，限制返回的血流量从远端肢体，造成静脉血液。

Pressure is applied with the thumb to restrict blood flow returning from the distal limb, causing the vein to engorge with blood.

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