The seven "Yes's" speak to why process improvements are difficult, and often require an outside catalyst -- one with built-in credibility and process experience for bootstrapping positive change.

七个“是的”证明了为什么过程改进是困难的，并且经常需要外部催化剂 —— 拥有内嵌的步步为营地积极变更的可靠性和过程经验。

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But in the actual process of using, CMAC often faces the problem occurred by the uneven distribution of units' credibility, therefore we use CA-CMAC instead of CMAC.

但是在实际的使用过程中，CMAC算法会产生可信度的分配问题，因此我们使用CA - CMAC来代替CMAC。

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What's at stake is the credibility of the United States in keeping a forward momentum in the often fractious and politically fraught movement for worldwide trade liberalization.

NPR: Central America Trade Deal a Hard Sell