他的写作和演讲提高了人们对保护自然的重要性的认识，并帮助建立了我们的国家公园系统。
His writing and speaking raised the awareness of the importance of conservation and helped bring about our national park system.
今年夏天，我们一家和我姑姑一家去了加拿大的国家公园。
This summer, my family and my aunt's family went to National Parks in Canada.
今年夏天，我们一家和我姑姑一家去了加拿大的国家公园。
This summer, my family and my aunt's family went to National Parks in Canada.
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