This must be kept absolutely secret.; This is strictly confidential.
这事绝对保密。
Please be convinced that all the materials you supply to us will be kept absolutely secret, for which you will not take any responsibilities.
请确信，我们对你们提供的所有资料都严加保密，你们不负有任何责任。
The importance of being physically and mentally active is no secret. I personally love the idea of being fit yet absolutely dread the treadmill.
这绝对不是一个秘密：身体上和精神上的双重积极是多么重要。
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