找出一件具有挑战性的事情，付出百分之百的努力然后彻底松放。
所以，投入到一件具有挑战性的事情中去吧。学一门外语。参加在线大学课程。熟练掌握一种乐器。让大脑动起来。让这一年成为值得铭记的一年。
So, take up a challenging activity. Learn a foreign language. Take an online college course. Master a musical instrument. Work that brain. Make it a year to remember.
在医疗领域，解决网络安全威胁的同时还要减少信息安全风险是一件非常具有挑战性的事情。
In the medical field, to solve the problem of network security threats while reducing the risk of information security is a very challenging thing.
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