Even then, the penguins are cautious; they stay in the water only long enough to feed, and they're adept at remaining motionless when they're on thin ice and spot a leopard seal.

尽管如此，企鹅也十分谨慎：它们仅仅在捕食时才呆在水下；一旦意识到冰面很薄或是附近出现海豹，它们就会紧紧地趴在冰面上，一动不动。

youdao

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

The bright spot in a drab employment picture is that workers have been stretched so thin during the past couple years that companies are going to have to (gasp!) hire more.

灰暗的就业前景中存在一丝亮点：过去几年雇员人数已压至如此之低，企业将不得不增聘人手(啊哈！)

youdao

The spot market was, and is, relatively thin, and with spot material in relatively short supply, buyers had to bid up price to quite high levels to establish positions.

FORBES: Uranium Market Glowing Green

This boosts the resolution tenfold, enough to spot plaque with thin fibrous caps that may be more unstable.

FORBES: Peeking at Plaque

Glocer notes on his blog that machines have increasingly replaced humans in high-velocity, thin-spread markets such as spot FX, cash equities and U.S. Treasuries.

FORBES: Magazine Article