This instance doesn't have any special constructors, operations, attributes, or references, so these calls aren't required.
因为本实例没有任何特殊的构造函数、操作、属性或引用,所以不需要这些调用。
You can reuse the Call instance to invoke other operations on the web service.
您可以重用Call实例来调用Web服务上的其他操作。
For instance, operations managers often make use of break-even analysis to determine how much be produced and sold before a product becomes profitable.
例如,运营经理常常利用盈亏平衡分析来确定为使一个产品能盈利至少要生产和销售多大的数量。
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