方法：采用正交实验法，以提油量为指标，对浸泡时间、提取时间、加水量三种因素进行了研究。
Methods: Soaking time, extraction time and the amount of water added were studied by the orthogonal test with the volatile oil's volume.
本实验尝试使用尿素水溶液浸泡杉木根后再用水蒸气法提取杉木根精油。
In our experiment, essential oil was attempted to extract from fir immersed in urea solution.
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