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.

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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.

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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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