工人即使只遲到五分鐘，也可能拖慢整條裝配線（生產線、流水線），造成僱主損失。他們需要可靠的方法準時起床，特別是在冬季天黑的時段。雖然當時已有早期的鬧鐘，但價格對一般工人而言過於昂貴。
平生第一次去县城，却没记住县城是什么样子，只记住了那次的社火场面。县城里的社火，胜过一切乡村的小闹腾。至今离开家乡已40多年，如今的闹元宵，形式和花样更加多样，每到此时，我总会想起记忆里的那些场景。
。业内人士推荐新收录的资料作为进阶阅读
At this January's massive NAMM music tech show in Los Angeles, six products won "best of show" awards. Several of them went to major music and electronic brands like Yamaha and Boss, but one of the six went to Neural DSP, a much smaller company started in 2017 by Chilean immigrants to Finland.，这一点在新收录的资料中也有详细论述
However, push-based systems typically are not particularly efficient, and it’s only with additional work that we can fix that. Let’s look at an example of a graph that creates unnecessary work.，更多细节参见新收录的资料