The lines were so finely etched as to be invisible from a distance.

这些线条蚀刻得如此精细，离远点都看不出来。

《柯林斯英汉双解大词典》

They are best known for the Nazca lines: vast, intricate drawings etched on the desert floor, possibly sacred pathways.

他们因为纳斯卡线条而闻名于世：蚀刻于沙漠上广阔、复杂的图案，可能是神圣的路径。

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COULD these lines etched into 60,000-year-old ostrich eggshells (see photo) be the earliest signs of humans using graphic art to communicate?

这些刻于60,000年前鸵鸟蛋壳上的字迹，能否成为人类使用版画交流的最早标记呢？

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Rotella, a trim 58-year-old with dark, bushy eyebrows and deeply etched laugh lines, has fashioned a career out of teaching the virtues of optimism.

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Equipped with a flat underside and cupped upper shell that resembles a skewed dome, they are etched with faint concentric lines that recall growth spurts.

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