The technical fluorene has been refined from the heavy wash oil with xylene.
以重质洗油为原料，二甲苯为溶剂精制工业芴。
The technical fluorene has been refined from the heavy wash oil with xylene. The optimum technological process and operation conditions are selected by the experiments.
以重质洗油为原料，二甲苯为溶剂精制工业芴。试验选出最佳的工艺路线与操作条件。
Winter was coming on and the hills threatened the surrounding villages with destruction, for heavy rain would not only wash away the soil but would cause serious floods as well.
冬季即将来临，这些山丘对周围的村庄具有毁灭性的威胁，因为大雨不仅会冲走土壤，而且还会引起严重的水灾。
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