some trains go through the hills if they are too high to go over 意思是：

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• 文章：There are all kinds of trains in the world.There are trains to carry people,trains to carry animals and trains to carry things.There are fast trains and slow trains.Some trains go under the ground and some trains go through hills.In big cities,the streets are usually very busy.So you can find trains under the ground and trains on a rail above the streets.They carry people in and out of the city.Can a train run over water?Yes,it can.There are many b
• some trains go through the hills if they are too high to go over 意思是：
• Some trains go____ the hills if they are too high to go over
• There are all kinds of trains in the world.ThereThere are all kinds of trains in the world.There are trains to carry people,and trains to carry animals or other things.There are fast trains and slow ones.Some trains go through hills.  In big cities,the main streets are usually very busy.So you can find trains on the rails under the ground or above the unimportant streets.They carry people quickly in and out of the cities.  Can a train run over the wat
• 如果可以,浓度~
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