youdao

youdao

Newgrange, County Meath, Ireland, was constructed over 5, 000 years ago (about 3, 200 B.C.), making it older than Stonehenge in England and the Great Pyramid of Giza in Egypt.

爱尔兰米奇郡的纽格莱奇墓建造于5000年前(大概是公元前3200年)，比英格兰的巨石阵和埃及吉萨大金字塔还要古老。

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So it's trigonal because we have these three atoms that are bound to the central atom here, and if you picture it, it's actually shaped like a pyramid.

这里三角形是因为,我们有3个原子核中心原子成键，如果你画它，它就是金字塔形的。

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