These examples illustrated the economic benefit of the recovery of magnetite, garnet, rutile, gregorite, zircon and building sand that were mined in the placer gold mine.
文中例举的事实表明砂金矿山回收磁铁矿、石榴石、金红石、钛铁矿、锆石及建筑砂石所收到的经济效益。
These examples illustrated the economic benefit of the recovery of magnetite, garnet, rutile, gregorite, zircon and building sand that were mined in the placer gold mine.
文中例举的事实表明砂金矿山回收磁铁矿、石榴石、金红石、钛铁矿、锆石及建筑砂石所收到的经济效益。
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