该下底座嵌入于该第二凹陷部。

The low base is embedded to the second concave part.

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该基板的该顶表面形成一第一凹陷部。

A first concave part is formed on the top surface of the base plate.

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该基板的该底表面形成一第二凹陷部。

A second concave part is formed on the bottom surface of the base plate.

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该基板的该底表面形成一第二凹陷部。

A second concave part is formed on the bottom surface of the base plate.

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