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| 21. | Ichthyosaurs with embryos have been reported from 6 different levels of the shale in a small area around Holzmaden, suggesting that a specific site was used by large numbers of ichthyosaurs repeatedly over time. |
| 这表明大量的鱼龙经年累月重复使用一个特定的地点。 |
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| 22. | Presently they came to a place where a little stream of water, trickling over a ledge and carrying a limestone sediment with it, had, in the slow-dragging ages, formed a laced and ruffled Niagara in gleaming and imperishable stone. |
| 不久，他们来到一个地方，那里有股溪流从突出的岩层上流下来，水里有石灰石沉渣，经年累月形成了瀑布一般的景观。 它四周好像嵌着边，起伏不平，水中的石头晶莹闪亮，永不消失。 |
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| -- 来源 -- 英汉文学 - 汤姆历险 - tangmulixianji31 |
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