Calling play() function required inserting element into the DOM first. This is so all sounds were actually pausable when user clicks away from the tiles. If you don't insert the element into DOM when playing, it's impossible to stop it without having the reference to the element.
Note cross-track compounding explicitly — it's usually where the worst failures live.
，详情可参考纸飞机下载
我的写作方式（正式, 随意, 技术性等） 声音特征观察到的信息 提到过的一些具体风格规则
and receiving of "records", which are blocks