| 词汇 | o-b |
| 语种 | 英语、汉语、英汉翻译、汉英翻译 |
| 释义 | o/b preposition ukus written abbreviation for on or before: used before a date in a document, invoice, etc. to show that the date shown is the last acceptable date for something to be paid or done: Investments must be received o/b April 5. |
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