A CAS operation includes three operands — a memory location (v), the expected old value (a), and a new value (B).

CAS操作包含三个操作数——内存位置(V)、预期原值(A)和新值(B)。

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The call to map walks through each value, aliases it to v: val, evaluates the expression in the string, and replaces the value with the result of that expression.

调用map可以遍历各个值，将其作为别名赋给v： val，在字符串中计算表达式，并用表达式结果替换值。

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The generic make method returns a Box for some type v, and the return value is being used in a context that requires a Box.

泛型make方法为一些类型V返回一个Box，返回值被用于需要Box的上下文中。

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Some of the battles are easy to predict: domestic businesses v. multinationals, manufacturers v. service firms, business whose value-added is in their intellectual property v. those who deal in commodity products.

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While the Quadricycle, the 1909 Model T and a 1932 V-8 Ford are cars you'd expect to see in an array of historic vehicles, the value of "Driving America" is in the way that it presents cars you would be more likely to find in a junkyard than a museum.

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