在多数情况下，应该选择使用Layout Managers，因为很容易调整它们来适应可变大小的GUI。

In most situations, you would choose to use LayoutManagers, as they make adjusting to variable-size GUIs much easier.

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端点可变性——可以在服务的位置选择方面实现可变点。

Endpoint variability-variation points can be implemented in the location choice for a service.

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而后种情况里，则实现了可变性的扩展，仅仅允许用户选择行业标准内的数据契约规范。

In the later case, it would extend this point of variability, and only allow the user to select an industry standard data contract schema.

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