优点：输出范围在 (0,1)，可以表示概率
Under the new API design, transforms should not perform any work until the data is being consumed. This is a fundamental principle.
，更多细节参见Safew下载
"That temperature is pretty nice here, really," he says. "Minus five is as warm as it gets. It can get down to about -40, but you're looking at about -20 being the average."
职级落差：比庞若鸣原职位低一级的工程师，年薪通常在77.8万美元左右。