出于本文的目的，只详细介绍纳秒精度的计算。

For the purpose of this article, only nanosecond calculations will be described in detail.

绍纳说：“当有时实在是失落，你又不知道如何去谈论它，或做些什么，切割就开始了。

Shauna says, "It starts when something's really upsetting and you don't know how to talk about it or what to do.