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Original file line number	Diff line number	Diff line change
`@@ -404,7 +404,7 @@ Shouldn't be null: arg s`
`404`	`404`
`405`	`405`	`#### check指令`
`406`	`406`
`407`		`-详细研究DbC之前，思考最简单使用断言的办法，Meyer称它为check指令。check指令说明你确信代码中的某个特定属性此时已经得到满足。check指令的思想是用表达代码中非明显性的结论，而不仅仅是为了验证测试，也同样为了将来能够满足阅读者而有一个文档。`
	`407`	`+详细研究DbC之前，思考最简单使用断言的办法，Meyer称它为check指令。check指令说明你确信代码中的某个特定属性此时已经得到满足。check指令的思想是在代码中表达非明显性的结论，而不仅仅是为了验证测试，也同样为了将来能够满足阅读者而有一个文档。`
`408`	`408`
`409`	`409`	`在化学领域，你也许会用一种纯液体去滴定测量另一种液体，当达到一个特定的点时，液体变蓝了。从两个液体的颜色上并不能明显看出；这是作为其中复杂的一部分。滴定完成后一个有用的check指令是能够断定液体变蓝了。`
`410`	`410`

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