I also added a subtle drop shadow to the green layer to separate it a bit more from the yellow.

我也利用了比较细的笔触来加了点阴影来区分绿色和黄色。

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This green layer is irrigated by the collection of building used water and rain in a smart drop irrigation procedure.

这个绿色层是由建筑用水和雨水的收集灌溉，是一个智能下降灌溉的过程。

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The algal blooms, which can be toxic to animals and human swimmers, leave behind an ugly layer of green scum that fouls tourist beaches and starves seaweeds of light.

海面上的赤潮对水里的动物和游泳的人来说都是有毒性的，赤潮藻还会在海面上留下一层难看的绿色浮渣，不但污染了供人旅游的海岸，还遮挡了海草的光线，使其不能生长。

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The green roof is a four-layer, matlike system topped with drought-resistant sedum.

FORBES: Lean Green Machine

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

The traffic layer, which lights up in red, yellow and green depending on the amount of traffic, also was particularly helpful on the way back to New York.

WSJ: Review: iPhone Google Maps lags Android version