sea floor spreading theory
... 海底煤田：submarine coal field 海底扩张说：sea floor spreading theory 海底扩张：Sea floor spreading ...
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They called their theory "sea floor spreading." the theory explains that as the sea floor spreads, the tectonic plates are pushed and pulled in different directions.
他们把他们的理论叫做“海底扩张”。这个理论解释了，随着海底扩张，板块在不同的方向上被推拉。
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