Removing process of light and soft impurity that is medium and low density is introduced.

介绍了煤中低密度轻软杂质清除的工艺过程。

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Or you need in normal light with a longer exposure under the condition of the time, when medium density mirror is your best choice.

或者你需要在正常光线条件下用较长的曝光时间，这时中密度镜就是你的最佳选择。

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Or you need in normal light with a longer exposure under the condition of the time, when medium density mirror is your best choice.

或者你需要在正常光线条件下用较长的曝光时间，这时中密度镜就是你的最佳选择。

youdao