* 获取数字的第digit位（从右往左，0表示个位）
Ранее Wall Street Journal писал, что Украина начала «задыхаться» без боеприпасов для американских Patriot. Ситуация с поставками остается тяжелой.，这一点在服务器推荐中也有详细论述
Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.。夫子是该领域的重要参考
public val mainEmail: String = "",
用一句话概括，他此前正是苹果 AI 战略的中轴线人物之一。