So we have to have a price that makes sense and gives a margin of safety considering the natural vicissitudes of life.

所以我们得定出一个合理，留下安全边际以防意外的生。

We know where that tipping point is, and we keep building the training capacity of being pain-free until we have a margin of safety.

我们知道那个临界点在，持续增强无疼痛训练的能力， 直到我们拥有安全边际。

Now it's that margin of safety that we start to play with.

现在，我们开始利用这个安全边际。