In fact, since the process can occur relatively quickly, it could be that the thin red layer of dust on Mars is somewhat new.

事实上，由于这一过程发生得相对较快，说不定火星上薄薄的那层红色尘埃层些许还是新近形成的呢。

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A layer of low clouds creates the dark red line along the lower part of the profile.

一层低空云层在剖面图的下方形成了深红色的线。

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Many desert sands have a faint red color caused by a thin layer of iron that precipitates from the atmosphere and coats the grains. (Magnification 85x)

有很多沙粒是红色的，这是由于其表面有一层薄薄的铁，这些铁元素来自于空气中。

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Both models also sport dual-layer backlit keyboards, with a snazzy red tone peeking out from under the black chiclet-style keys.

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The cookie to emerge from my auditions this year is a tri-color butter cookie: a layer of red, green and white dough rolled and sliced into a gorgeous swirl.

NPR: Pursuit of the Perfect Christmas Cookie