When understanding a concept requires effort, we usually abandon it in favor of practical tips.
当需要付出相当努力才能理解一个概念的时候，我们通常会放弃它而代之以利用更实用化的窍门。
When you began to work, you might work out a practical scheme.
当你开始工作时，你可以先制定出一个可行的计划。
When you have the practical information you need, open a trading account and start trading.
当你拥有了这些有需要的实践信息，开一个交易帐户并开始交易。
When a practical system is discerned, its construction is often not known.
在实际系统的参数辨识中，系统的结构往往并不知道。
Members of the family lend each other moral support and also practical help when necessary.
家族中的成员相互给予精神鼓励和必要时的实际帮助。
They're darn practical to have around when you need them!
当你需要的时候你会发现拥有弹力绳是多么实用。
Stress product's function value when propagating the brand of practical products.
在宣传实用型产品品牌时，应该重点突出其功能价值。
Stress product's function value when propagating the brand of practical products.
在宣传实用型产品品牌时，应该重点突出其功能价值。
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