agate [ˈægət]

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n.玛瑙

a hard stone with strips of colour , used in jewellery

He saw before him a flight of agate steps. 他看到前面有一段玛瑙做的台阶。
It is round, like the size of a small yellow agate. 它是圆的，大小很像一个小的黄色的玛瑙。