它们向我们介绍不同种类的知识，它指导我们沿著成功之路前行。
They introduce us different kinds of knowledge. They lead us down the road to success.
它们向我们介绍了不同种类的知识，它们引领我们走向成功的道路。
They introduce us different kinds of knowledge. They lead us down the road to success.
另外还要普及不同种类垃圾的相关知识。
Besides, the knowledge about different kinds of rubbish should be well popularized.
另外还要普及不同种类垃圾的相关知识。
Besides, the knowledge about different kinds of rubbish should be well popularized.
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