| 单词 | billion | 
| 释义 | bil·lion   (bĭlyən) n. 1.  The cardinal number equal to 109. 2.  Chiefly British   The cardinal number equal to 1012. 3.  An indefinitely large number. [French, a million million : blend of bi-, second power; see  BI-1 and MILLION.] billion adj. | 
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