Oil slicks are notoriously difficult to spot in natural-color (photo-like) satellite imagery because a thin sheen of oil only slightly darkens the already dark blue background of the ocean.

浮油出名的难以被发现在天然色卫星图像上，因为稀薄光泽的石油仅仅略黑于深蓝色的大海。

youdao

Only extra-virgin olive oil will do on recherché dinner tables.

只有特纯橄榄油才能上讲究的餐桌。

《柯林斯英汉双解大词典》

As for ANWR's impact on the California power crisis, environmentalists point out that oil is responsible for only 1% of the Golden State's electricity output and just 3% of the nation's.

至于 ANWR 对加州电力危机的影响，环保人士指出，石油仅占加州电力输出的1%，全国电力输出的3%。

youdao

Soybean is an important seed around the world, but it is only twenty percent oil.

VOA: special.2009.09.29

If you agree with my estimates, then you should do this as an investor, you should hold only some mixture of this tangency portfolio, which is 9% oil, 27% stocks, and 64% bonds.

如果你赞同我的估计值，那么作为一个投资者的话你应该这么做，你应该只持有,符合这个切线投资组合比例的投资，即9%的石油，27%的股票，和64%的债券。

耶鲁公开课 - 金融市场课程节选

Oil became a useful product only in the middle of the eighteen hundreds.

VOA: special.2010.02.25

In one study, researchers made three types of cakes: margarine only, extra-virgin olive oil only, and a combination of olive oil and margarine.

CNN: A family's guide to healthy food substitutes

The reserves, stored in Texas and Louisiana, were started during the U.S. oil embargo in the early 1970s, and have been used as a back-up measure to supply oil only a few times since that decade.

FORBES: Oil Heads Higher, Markets Open Up

But unlike Libya's abrupt disruption, the new sanctions are expected to affect oil markets only gradually.

WSJ: Oil Market's Iran Fears Might Be Overdone