求中译： Why hasn't observation of the water surface yielded an accurate size of the BP spill? 我的试译： 为啥水面BP漏油量的观测报告......呃 提问： 那个yield在这句是什麽意思? 我隐约觉得这句是在说实际漏油量比观察到的多? 这题的答案是 1. The spill is so deep underwater. 2. Chemical dispersants are mixing oil into the water. 3. The physical properties of the oil are changing in the water. 以上皆是 Scientists have confirmed that some oil is beneath the water surface, which is believed to be due to a variety of factors. 来源：http://tiyurl.com/ngc0628 源网址： http://environment.nationalgeographic.com/environment/energy/great-energy-challenge/oil-spill-quiz/?source=foenvfeat1 -- 存活10分钟的巧克力饼乾屋的遗照... http://zo4.blog82.fc2.com/page-1.html --

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