there are lots of cars.old cars are a major cause of pollution.把这两句话练成一句话 中间该用什么?what that

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there are lots of cars.old cars are a major cause of pollution.把这两句话练成一句话 中间该用什么?what that
there are lots of cars.old cars are a major cause of pollution.
把这两句话练成一句话 中间该用什么?what that

there are lots of cars.old cars are a major cause of pollution.把这两句话练成一句话 中间该用什么?what that
among which

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