短语讲解：

1. Road trips have been popular with Americans for almost as long as their love of cars.

as long as 只要; 如果; 既然
例句：You may borrow this book as long as you keep it clean.
只要你不把书弄脏，就可以借给你。

2. Some are as simple as the meeting of three states in the middle of a lonely dirt road.

in the middle of 在…的中间
例句：I was in the middle of the back row
我在后排的中间。

3. A twisted house in the shape of an arrow brings in visitors too.

in the shape of 以…形式
例句：This island is in the shape of a cross.
该岛呈十字形。
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