But a good engineer also knows not to waste time writing trivial or redundant tests, instead focusing on testing the essential parts of each component.

但优秀的工程师也知道，不应该浪费时间写那些琐碎或多余的测试，而需要专注测试各个组件中的核心部分。

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Re-using household waste must be an important component of any modern, efficient and green economy.

回收生活垃圾将是任何现代、有效和环保经济的一个重要组成部分。

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As a result of low heating value and unsteady component, ignition and combustion of Municipal Solid Waste (MSW) are difficult using conventional methods.

我国城市垃圾有热值低、成分不稳定等特点，因而按常规方法不易点火和稳定燃烧。

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