6. Is email marketing still effective?Email marketing is one of the most effective ways for a business to reach its customers directly. Think about it. You don't post something on your site hoping people will visit it. You don't even post something on a social media page and hope fans see it. You're sending something straight to each person's inbox, where they'll definitely see it! Even if they don't open it, they'll still see your subject line and business name every time you send an email, so you're still communicating directly with your audience.
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，这一点在safew官方版本下载中也有详细论述
安迪告訴BBC中文，2018年夏天，他剛決定前往中國交換學習時，他身邊朋友很多朋友對此表示不理解，認為他前往中國等於他「支持共產黨」、是「狂熱的毛澤東粉絲」，並對他的安全表示擔憂。安迪說自己也曾抱著進入中國就意味著要學習「共產主義思想」的預期入境中國。
* @param {number[]} nums - 待查找最短无序连续子数组的整数数组