When you make a trade, let it be for some good reason or according to a definite plan; then do not get out without a definite indication of a change in trend.
每做一手交易时，你都要有可以依据的理由或者明确的计划；此后，除非有明确的趋势改变的迹象，不要退出。
It was enjoyable and fun as well as a definite way to make Floyd laugh.
它是愉快和乐趣，另外一个明确的方式制造佛洛伊德的笑声。
It is the keystone of building the network databases' security system for us to make definite the sources and their dangers of potential safety problems, and then propose some specific solutions.
明确安全隐患的来源及其危害性，并提出针对性的解决方法，是网络数据库安全体系构建的重点。
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