You need to do this because the WS-Security specification allows attaching multiple tokens for authentication, thus additional metadata is required to identify which is the primary security token.
这样做的原因是因为WS - Security规范允许为身份验证附加多个令牌，这样就需要更多的元数据来识别哪一个是主安全令牌。
One inherent limitation of the forward converter is that the transformer must be reset during the power transistor off period. Thus, additional reset circuitry has to be used.
但是它的一个固有缺陷是功率晶体管截止期间变压器必须磁复位，因而需要采用附加的复位电路。
Thus, additional instruments are required.
因此，需要另外的器材。
Thus, additional instruments are required.
因此，需要另外的器材。
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