The if condition after the tuple is a guard.

这个元组后面的if条件是一个守卫。

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You can also associate a condition (known as a guard) with the transition.

您还可以将一个条件（称为监护）与转换关联在一起。

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Use: Air condition, furniture of yard, guard fence of road etc.

空调、庭院家具、公路护栏护网、户外配电柜等。

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Use: Air condition, furniture of yard, guard fence of road etc.

空调、庭院家具、公路护栏护网、户外配电柜等。

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