A two-year subscription to ExpressVPN is on sale for $68.40 and includes an extra four months for free — 81% off for a limited time. This plan includes a year of free unlimited cloud backup and a generous 30-day money-back guarantee. Alternatively, you can get a one-month plan for just $12.99 (with money-back guarantee).
FT Edit: Access on iOS and web
，这一点在safew官方版本下载中也有详细论述
func (*Option) ArgFloat32 ¶
+sleep_min: float