| 单词 | 包层硬币 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔sandwich coin〕A coin having a layer of one metal, such as copper, between exterior layers of a different metal, such as silver.简易硬币，包层硬币：一种硬币，夹层为一种金属（如铜夹层），外层为不同金属（如银外层）美国传统 |
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