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They put string over the holes to help them make maps.
他们在洞的上面拉上绳子，来帮助他们制图。
youdao
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Who put forward a theory about black holes?
谁提出了黑洞理论？
youdao
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Who put forward a theory about black holes?
谁提出了关于黑洞的理论？
youdao
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Who put forward a theory about black holes?
谁提出了关于黑洞的理论？
youdao