Any small change in the ethnic or class balance is immediately noticed.

任何种族和阶级的微小的变化都应该引起注意。

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For example, a bank - account class might have a method to calculate a balance.

例如，一个银行帐号类可能具有一个计算余额的方法。

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For example, a bank - account class might have a method to calculate a balance.

例如，一个银行帐号类可能具有一个计算余额的方法。

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