2. 分区：小于pivot的放左边，大于的放右边
var tasks []task，更多细节参见服务器推荐
新车后排座椅采用错落布局，三人乘坐也能保证肩部与腿部空间的宽敞舒适；同时新车还贴心地借鉴了 MPV 的低台阶设计，方便乘客上下车。，这一点在爱思助手下载最新版本中也有详细论述
The Streams Standard was developed between 2014 and 2016 with an ambitious goal to provide "APIs for creating, composing, and consuming streams of data that map efficiently to low-level I/O primitives." Before Web streams, the web platform had no standard way to work with streaming data.