1.
A piece of magnetite that has magnetic properties and attracts iron or steel.
天然磁石有磁性的磁铁矿，能吸引铁或钢
2.
Over 4000 years ago, the laboring people of ancient China noticed the attracting property of the natural magnet.
四千多年前，中国古代的劳动人民就注意到了天然磁石的吸引性质。
3.
Preparation and Adsorption of Recyclable Magnetically Modified Natural Zeolites
可循环磁性天然沸石的制备及其吸附性能研究
4.
Natural Resources: crude oil, natural gas, limestone, fish.
自然资源：原油、天然气、石灰石、鱼。
5.
a salt found in nature as chalk or calcite or limestone.
白垩、方解石或石灰石等天然的盐。
6.
estimation of oil and gas reserves
石油和天然气储量计算
7.
natural road, partly metalled
天然道路，一部分铺碎石
8.
insert natural diamond bit
天然金刚石镶齿钻头
9.
International Committee on Natural Zeolites(ICNZ)
国际天然沸石委员会
10.
oil and natural gas map
石油和天然气分布图
11.
natural uranium graphite reactor
天然铀石墨慢化反应堆
12.
He's a diamond in the rough.
他是一颗天然的宝石。
13.
"fossil fuels: coal, oil, and natural gas"
矿物燃料(煤、石油、天然气)
14.
Coal and oil are natural products.
煤和石油是天然物产。
15.
artificial foliage of natural stone(non-precious)
人造叶饰,天然石料（非宝石）制
16.
artificial fruit of natural stone (non-precious)
人造蜡制水果,天然石料（非宝石）制
17.
cachou box of natural stone (non-precious)
天然石料（非宝石）制口香糖盒
18.
bowl of natural stone [non-precious, excl. antiques]
天然石料制碗[非宝石,不包括古玩]