source of crude的意思|示意

Nigeria, the fifth-biggest source of oil imports for the U.S., holds reserves of more than 36 billion barrels of crude and 187 trillion cubic feet of gas.

尼日利亚美国第五大原油进口来源国拥有超过360亿桶原油储备和1亿8千7百万立方英尺的天然气储备。

Moreover, because gas is frequently encountered in association with oil, the production, refinement, transportation, and storage of crude oil is also a source of methane emissions.

此外，由于天然气常与石油混在一起，原油生产、提炼、运输和储存也是一个甲烷排放来源。

The regular features of aromatics distribution in the sediments with different sedimentary environments are useful in the research source of crude oil.

这些不同沉积环境地层的芳烃分布规律，可用于研究原油的油源。