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Afterward, the seas became far more complex with mobile creatures such as snails, urchins and crabs.
此后, 海洋生物逐渐丰富起来,海洋里生长着大量移游生物,比如腹足类 、 海胆类和蟹类.
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Scientists have long used sea urchins to study fertilization and early development in humans.
科学家们一直用海胆来研究受精卵和人类早期形态.
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There is always the secret vote. I don't think we could make any written undertakings.
秘密经费总是有的. 我想我们不能写任何书面保证.
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In 1962 there more than 80 undertakings in western Germany engaged in the gypsum industry.
1962年在西德有80家以上的企业从事石膏工业.
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