5. “Subject traces are for topics. Place a quick explanation of the character of your e-mail (like “concern about paper”) in the topic line. In no way contain calls for including “urgent request—fast reaction wanted.” That’s the surest way to get your request trashed.” 王老师提醒：因为大家可能受咱母语的影响，所以有时候说话绕的圈子比较大，在这里建议大家对于哪方面的知识有问题的直截了当... https://sparxsocial.com/story1260325/the-best-side-of-%E8%8B%B1%E6%96%87%E9%82%AE%E4%BB%B6%E4%B8%BB%E9%A2%98