| 单词 | balloon floats | 
| 释义 | balloon floats Whether a balloon floats doesn't determine the student's grade, she said.  Houston Chronicle   The balloon floats because of the buoyant force exerted on it.  Retrieved from Wikipedia CC BY-SA 3.0   A purple balloon floats above a few sentences about the expanding universe.  Retrieved from Wikipedia CC BY-SA 3.0    | 
	
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