18. Each female digs a shallow pit in the sand, where she lays tens of thousands of tiny, blue-green eggs, usually in clusters of a few thousand.
母的马蹄蟹在沙滩上挖掘浅坑，然后，每个母的在那里产下数万个小小的，蓝绿色的蛋，通常几千枚蛋一堆。
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19. The water ranges from black to a rich blue-green tone, its color intensified by the contrast between it and the winter white landscape around it.
河水颜色从黑色过渡到深蓝绿色，而且由于与周围冬天景观（一大片）的白色对比，显得更加突出。
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20. It includes narrowband images recorded using filters sensitive to emission from oxygen atoms, shown in blue-green hues, and hydrogen atoms in red.
图中包括了使用对氧原子放射物敏感的过滤器记录的窄频带图像，以蓝绿色表示，而氢原子以红色表示。
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21. Plants and cyanobacteria (also called blue-green algae), she says, “have evolved highly organized photosynthetic systems for the efficient oxidation of water.”
植物和蓝藻（又称蓝绿色藻类），她说，“已经进化为高度的有组织的光合系统以有效的氧化水。”
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22. For example, I see a color I call blue-green, which to me is blue with a touch of green. Someone else may call the color green-blue, because he sees more green than I do.
23. As well threatening certain species, blue-green algae can also pose a risk to human health, and officials are advising people not to bathe in areas where the algae is visible.
以及物种的威胁，蓝绿色海藻还可能影响人类的健康，专家建议人们不要在有藻类的地方洗澡。
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24. The train sped on; the broad fields with their blue-green border trees, and the villages nestling in their shade flew past in a stream of pictures which melted away like a flood of mirages.
