单词：valid period
[经] 有效期限
valid period的用法和样例：
例句
- The term of validity of the coal production license shall be the same as the production and service period of the coal enterprise.第十条煤炭生产许可证的有效期限与煤矿企业的生产服务年限相同。
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period------------时期 peculiar---------- 特别的 percent----------百分比 perhaps--------- 大概
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