To prevent errors, you can wire properties only to actions that have the same type.
为了避免出错，只能将属性连接到相同类型的操作上。
Only delegates of the same type can be combined.
只有相同型别的委派可以结合。
Change lamp when lifetime expired. Replace expired lamp only with same type and rating.
当灯泡寿命终结时要予以更换。必须以同样型式和规格的灯泡进行更换。
Change lamp when lifetime expired. Replace expired lamp only with same type and rating.
当灯泡寿命终结时要予以更换。必须以同样型式和规格的灯泡进行更换。
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