n.冲积矿,放置者;砂积矿床;淘砂;沙矿;
例句:
1、
Pinggui Sn placer in Guangxi was discovered and exploited as early as the Bronze Age.
“平桂”砂锡矿,早在“青铜时代”已被发现、开发利用.
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2、
3、
A new technic of purifying gold, silver from placer gold without pollution was proposed.
提出了一种无污染从砂金中提纯金 、 银新工艺.
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