valid

adj.

有效的；有法律效力的；正当的；健全的

valid period有效期限

valid certificate有效证书；有效凭证

valid until有效期至

valid data有效数据

must be valid必须实事求是

valid time有效时间

valid contract有效合同；有效契约

valid from有效起始日期

valid date有效期

valid business registration certificate有效商业登记证

1. Please provide a valid screen name.
   请输入有效的显示名。
2. A credit card is not a valid proof of identity.
   银行发的支票保付卡不是有效的身份证明文件。
3. Whether or not you believe the lawsuit is fair or valid, it is vital that you act on the summons.
   无论这起诉讼是否是公平的或者是有根据的，认真对待传票对当事人来说是至关重要的。
4. The values may be valid,but are not allowed contextually.
   提供的值可能是合法的，但是在当前的上下文环境中不被允许。
5. Illness is a valid excuse for being absent from work.
   生病是不去上班的正当理由。

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Views of nature of science questionnaire: Toward valid and meaningful assessment of learners' conceptions of nature of science.
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Revision and Restandardization of the Conners Teacher Rating Scale (CTRS-R): Factor Structure, Reliability, and Criterion Validity
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