In the A, B, C, D and F grading system, the first four letters are typically considered passing grades.
在A、B、C、D和F评分体系中，前四个字母通常被认为是及格。
After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听到问题后，必须从A、B、C、D四个选项中选出最佳选项。
Three other types of airspace, Classes D, C and B, govern the vicinity of airports.
其他三种领空，D、C和B类，管理着机场周围地区。
For each of them there are four choices marked A, B, C and D. You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the centre.
每题都有对应标记的A、B、C和D四个选项，请选择最佳选项并在答题卡2的相应字母中间划横线。
Theodore and Franklin D. Roosevelt, William Howard Taft, Dwight D. Eisenhower, Lyndon B. Johnson, Gerald Ford, and George H. W. Bush all had offices in this building before becoming president.
西奥多、富兰克林·罗斯福、威廉·霍华德·塔夫脱、德怀特·艾森豪威尔、林登·约翰逊、杰拉尔德·福特和乔治·布什在成为总统之前，都曾在这座大楼里就职。
Theodore and Franklin D. Roosevelt, William Howard Taft, Dwight D. Eisenhower, Lyndon B. Johnson, Gerald Ford, and George H. W. Bush all had offices in this building before becoming president.
西奥多、富兰克林·罗斯福、威廉·霍华德·塔夫脱、德怀特·艾森豪威尔、林登·约翰逊、杰拉尔德·福特和乔治·布什在成为总统之前，都曾就职于这座大楼里。
Oil production from Daqing peaked at about 1.1m barrels per day (b/d) in 1997.
大庆的石油产量在1997年达到峰值——每天110万桶（b/d）。
Figure 3: Performance TAB shows you a letter grade (a, b, c, d, f) and a percent grade (1-100).
图3：性能标签使用字母(A,B,C,D,F)表示等级以及当前等级(1- 100)。
It's also potent in antioxidants and vitamins B and d.
而且野生鲑鱼中还富抗氧化物以及维生素b、D。
“They're learning the physical skills of dentistry from the very beginning,” said Dr. John B. D. Featherstone, dean of the UCSF School of Dentistry.
“他们正从最初的动手能力学起，“约翰·费瑟斯通说，他是UCSF牙科分校的院长。”
That is even more expensive than it sounds, because each well produces only a small amount: perhaps 180 b/d, compared with as much as 7, 000 b/d from some Persian Gulf wells.
而这实际上比它听起来要昂贵的多，因为每个油井只能产很小一部分数量的石油：大约180桶／天，而与之相比，波斯湾的油井的日产量为7000桶／天。
Of that, some 1m b/d is sold at subsidised prices at home or to regional allies, leaving just 1.25m b/d for full-price exports.
还有，每日约100万桶石油在国内或区域联盟国中以优惠价格卖出，因此每日只剩下125万桶石油是以全价出口。
World demand grew by an extraordinary 2.7m b/d in 2010, according to the International Energy Agency.
依照世界能源署的数据，2010年里世界的需求每日额外增加270万桶。
The shutdowns bring the total volume lost so far to at least 350,000 b/d, or about 22 per cent of Libya’s production and equal to Greece’s demand.
迄今为止，上述停产已导致利比亚的石油日产量下降了至少35万桶，相当于该国总产量的22%或整个希腊的需求。
Average extractions costs there will increase from just over $12 a barrel in 2011 to more than $15 in 2035, as production increases by more than 17m b/d.
随着每天增加1700万桶产量，平均炼油成本从2011年的12美元每桶上升到2035年的超过15美元每桶。
Saudi Arabia increased oil production by 700, 000 barrels a day last month, to reach a total of 9.7m b/d, according to the International Energy Agency.
据国际能源署称，上个月沙特阿拉伯把每天的产油量增加到了每天70万桶，达到了9.7mb/d。
The IEA reckons that OPEC has no more than 2m barrels per day (b/d) of spare capacity—just over 2% of global demand.
IEA估计欧佩克的剩余产油能力不多于每天200万桶—这仅仅是全球需求总量的2% 。
Analysts estimated that Venezuela lost as much as 400, 000 b/d of production capacity for ever, not to mention billions of dollars in revenue.
分析人士估计，委内瑞拉从此失去了日产40万桶的生产能力，更别提数十亿美元的财政收入了。
Oil production, now 350, 000 barrels a day (b/d), is reviving faster than expected.
目前的石油产出量是每天35万桶，比原本的预计更多。
The International Energy Agency (IEA) reckons that around 1m b/d has stopped flowing as a result of fighting that shows no signs of abating.
据国际能源总署推测，随着内战不断进行，且没有消退的迹象，每天已经约有100万桶停止流动。
That should rise to 1m b/d within four or five months, he says, reaching pre-war levels of 1.6m late next year.
他还说，产量应在四至五个月内达到每天100万桶，明年年底达到战前每天160万桶的水平。
Things have gotten better, but she'll still make the occasional "b-d" or "5-2" flip.
虽然比前面那位好多了，但她还是会把b和d，5和2搞混。
The oil price has retreated from its peak in the past ten days largely because Saudi Arabia says it is pumping up to 600, 000 b/d to replace the shortfall in Libyan exports.
油价从过去十天里的高价位回落，主要是因为沙特说每日会额外产出60万桶来弥补利比亚石油输出的缺口。
Saudi Arabia has only offered to boost its output by 200,000 barrels a day (b/d), about 0.2% of the world’s current consumption of 87m b/d.
第一沙特承诺增加的产量为20万桶/天（b/d）,大约只占全球每天消费量8700万桶的0.2%。
Saudi Arabia has only offered to boost its output by 200, 000 barrels a day (b/d), about 0.2% of the world’s current consumption of 87m b/d.
第一沙特承诺增加的产量为20万桶/天（b/d）,大约只占全球每天消费量8700万桶的0.2%。
The Saudis are set to pump an extra 700,000 b/d and Kuwait, Nigeria and the United Arab Emirates may add another 300,000 b/d.
沙特准备增加700 000桶日产量；科威特、尼日利亚和阿联酋也可以增加300 000桶。
The Saudis are set to pump an extra 700,000 b/d and Kuwait, Nigeria and the United Arab Emirates may add another 300,000 b/d.
沙特准备增加700 000桶日产量；科威特、尼日利亚和阿联酋也可以增加300 000桶。
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