函数 update() 用于（在任何部件上）强制渲染并且等待所有进行的事件全部完成。

The update() function can be used (on any widget) to force rendering and to wait until all pending events have been processed.

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过去的数年间，中国针对构成整车价值50%以上的进口部件强制征收25%的特别关税，而普通商品的关税率只有10%。

For the past few years China has imposed a special 25% tariff on imported car parts, rather than the usual 10%, if the parts made up more than half of the value of a vehicle.

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另外，管理员可以定义强制的小部件，即在任意Community页面上显示并且Community所有者不能删除的小部件。

Additionally, the administrator can define mandated widgets, that is, widgets that are displayed by default on any Community page and that cannot be removed by the Community owner.

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