| 单词 | positional notation |
| 例句 | Without a positional notation system, arithmetic is tedious and hard, as schoolchildren learn when teachers force them to multiply or subtract with Roman numerals. 1491 2005-10-10T00:00:00Z And it is a placeholder in a positional notation system, such as our *Actually, it didn’t. 1491 2005-10-10T00:00:00Z |
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