Want to compare the cost of their crossing-over and income from social Angle.
要从社会的角度比较它们互换的成本和收益。
On the other side, this system is different from the normal railway crossing alarm device.
另一方面，系统有别于常规的铁路道口报警装置。
The policeman kept the children from crossing the road when it was dangerous.
危险的时候，这位警察阻止了孩子们过马路。
The policeman kept the children from crossing the road when it was dangerous.
危险的时候，这位警察阻止了孩子们过马路。
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