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单词 seal system
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原声例句
TED-Ed(视频版)

The result is a naturally sealed system.

结果是一个自然密封的系统。

阿尔伯塔大学-恐龙古生物学

Although sauropods were undoubtedly bigger, they did not produce the largest eggs that we currently know of Although many types of eggs have hard shells they are not a sealed system.

尽管蜥脚类动物无疑更大,但它们并没有产生我们目前所知的最大的蛋。尽管许多类型的蛋都有硬壳,但它们并不是一个密封的系统。

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