Walkers can unwittingly damage the fragile environment in which the birds live.
徒步旅行

无意中破坏鸟类生活的脆弱环
。
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典英语美文背诵100篇 
学人(汇总) He had spent ten years with the Dursleys, never understanding why he kept making odd things happen without meaning to, believing the Dursleys' story that he had got his scar in the car crash which had killed his parents.
他在德思礼家住了十年,一直搞不懂他为什么能在无意中导致一些古怪的事情发生,相信着德思礼一家所说,他的父母死于车祸,他的伤疤也是在车祸中留下的。