这种模型主要采用壳单元来模拟焊缝，这样不但很好地保证母体板材与贴板的连接，而且大大减少了前处理的工作量。

In the model, shell elements are adopted to simulate welds, which not only well ensure the connection between parent plates and flitch plates, but also was the work amount of pretreatment reduced.

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胎盘是连接母体和婴儿的器官，为婴儿提供氧气和食物。

The placenta is the organ that unites the mother with the baby and provides air and food.

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