Accept and continue
A spokesman for the Covid inquiry said: "The inquiry is unlike any previous public inquiry. It was given a very broad scope because it is investigating multiple aspects of a pandemic that affected everyone in society."。关于这个话题，safew官方版本下载提供了深入分析
Green: On the road again，这一点在safew官方下载中也有详细论述
// 栈不为空时才判断（避免访问stack.at(-1)时报错）