为了保证成功，我们必须要有一个周密的计划。
In order to ensure success we must have a complete and thorough plan.
虽然努力不能保证成功，但它是最基本的要求之一。
Working hard is not a guarantee of great success, but it is among the essential requirements.
我必须指出新药的试验很昂贵，而且你永远不能保证成功。
I must point out that trials of new medicine are expensive and you can never guarantee success.
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