（二）业务之间具有明显的主附关系。主要业务居于主体地位，体现交易的实质和目的；附属业务是主要业务的必要补充，并以主要业务的发生为前提。
Sam Altman would like to remind you that humans use a lot of energy, too
，这一点在51吃瓜中也有详细论述
重点领域突破，发展动能全面提升
operated on a stack-backed slice up to the return point.
// not critical but safer when bytesToWrite != view.byteLength