The economic downturn is drying up demand for oil and natural gas, dropping the benchmark price for a barrel of oil to below $50.
经济低迷正在抑制市场对石油和天然气的需求，导致基准原油价格跌破每桶50美元。
2
The amount of gas used means that a barrel of Californian heavy oil gives the stuff from Canada's tar sands a run for its money in terms of associated greenhouse-gas emissions.
根据相关的温室气体排放，天然气的耗费量意味着每桶加州重油竭尽全力从加拿大沥青砂岩中提取材料。
3
The BRG-15 had conventional, gas operated action with rotating bolt, locking into the barrel extension.