1. During the course of this period, if he or she can`t obtain promotions on knowledge, experience and technology, then undoubtedly, he or she has let a section of his or her glorious youth slip idly by, even he or she has got the repayment of work or the necessary of life——money.
如果在这个时期，一个人不能得到学识、经验和技术上的提升，那么无疑他已经虚度了一段美好的青春，即使他也得到了工作的回报、生活的必须——钱。
let slip idly by的近义词
2. We must not let our youth slip idly by.
我们不能让青春虚度。