- 相关例句
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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