Methods: L8 (27) orthogonal design was applied to select the optimum extraction conditions.
方法：采用L8(27)正交设计实验筛选较优的提取工艺条件。
After l8 hours of surgery and weeks of intensie care, Michael was released from the hospital with rods placed in his back.
经历了18个小时的手术和数周的精心护理，迈克尔出院了，背部装有金属杆。
After l8 hours of surgery, and weeks of intensive care, Michael was released from the hospital with rods placed in his back.
在经历了18个小时的手术和数周的精心护理之后，迈克尔出院了，背部装有金属杆。
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