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。
2
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。
3
As a result of low heating value and unsteady component, ignition and combustion of Municipal Solid Waste (MSW) are difficult using conventional methods.