We now clean out the trace and run again
现在我们可以清除跟踪，并再次运行代码
The evaluation is that the eye is clean, there is no trace of impurities .
的评价是，眼睛里是干净的，没有一丝杂质。
The study of trace elements was focus of clean coal technology in the world.
煤中微量元素是世界洁净煤研究的热点；
The study of trace elements was focus of clean coal technology in the world.
煤中微量元素是世界洁净煤研究的热点；
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