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The unit tests at the base of the pyramid are important for several reasons.
在金字塔底部的单元测试很重要，这有几个理由。
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The internal structure of silica has a pyramid(tetrahedron) unit.
硅的内部结构是一个四面体。
youdao
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The internal structure of silica has a pyramid(tetrahedron) unit.
硅的内部结构是一个四面体。
youdao