预约成功
New words and expressions 生词与短语
mineral
adj. 矿物的
boring
n. 钻孔
derrick
n. 井架
block and tackle
滑轮组
haul
v. 拖，拉
rotate
v. 使转动
cutting bit
钻头
geologist
n. 地质学家
coring
取芯钻头
cylinder
n. 圆柱体
strata
n. 岩层[复]([单]stratum或strata [误用])
circulate
v. 注入，环流
gusher
n. 喷油井
