早上我们走海边的道路去雅法，海滩上一片静悄悄，沙滩上昨天的车痕已经不见了踪影。
The morning we took the coastal route to Jaffa, the beach was quiet. There were no signs of the plastic chaise longues that had covered the sand the day before.
目的：采用正交试验法优选吉如痕- 8滴丸中挥发油的提取工艺。
Objective: To optimize the extraction process of volatile oil in Jiruhen-8 dripping pills by orthogonal design.
本文利用有限元法对塑料管材的挤出进行模拟。主要讨论了影响塑料管材挤熔接痕形成的因素，以及管子冷却过程的热传递。
This essay described the FEM simulation of plastic pipe extrusion: the factors of melt line formation and heat transfer of cooling processing were mainly discussed.
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