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信息发布者：

red

wait

left

safe

road

 They can wait for the green light.

 Don't play football on the road.

 She can look left and right first.

示例：

①

It's the green light.

We can look left and right first.

Then we can cross the road.

②

It's the red light.

We can't cross the road.

We can stop and wait.