你穿过马路时先看左边再看右边。

Before you cross a street, you must look at the left first and then right.

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当我们穿过马路时，我们必须等待绿灯。

When we go across the road, we must wait for the green light.

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他在穿过马路时，被一辆轿车从身上碾过。

Crossing the road, he was run over by a car.

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一只蜗牛穿过马路时，被一只乌龟踩过去了。

When a snail crossed the road, he was run over by a turtle.

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一只蜗牛穿过马路时，被一只乌龟踩过去了。

When a snail crossed the road, he was run over by a turtle.

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