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本协议有效期为一年，友好协议可以延长。
This agreement is valid for one year, and friendly agreement can be extended.
youdao
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怎样延长血液的有效期？
Could the dating period of blood be extended?
youdao
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他们申请延长签证有效期。
They applied for an extension to their visas.
youdao
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他们申请延长签证有效期。
They applied for an extension to their visas.
youdao