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一段陈述具有说服力并可信，要么是因为它直接不言自明，要么是因为它似乎可以由其他具有说服力并可信的陈述证明。
A statement is persuasive and credible either because it is directly self-evident or because it appears to be proved from other statements that are so.
首先，通过清楚的正式语言来表明意思，其次准确描述要求最后，明⓭ 晰地陈述可以允许的数量上的变动。
Well. first. make meaning clear by using concise. forma language. Second. describe accurately the exact requirement. Finally , state clearly the permissible variation in quantity.
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