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gold常作定语，表示“金子的，金质的”
e.g. gold mine; gold ring; gold medal
区分：
golden adj. 金色的，金子般的，珍贵的
e.g. golden hair; golden opportunity; golden eye
Speech is silver, but silence is golden.
雄辩是银，沉默是金。
treasure n. 1. 金银财宝（通称词）
e.g. buried treasure; hidden treasure; sunken treasure
come true =come into reality
A new machine called 'The Revealer' has been invented and it has been used to detect gold which has been buried in the ground.
过去分词作定语
a new machine called ...
a new machine (which was) called …
