[课文内容]
A DAY IN THE CLOUDS
The air is thin and we have to rest several times on the short hike① from camp. To our left, snow-covered② mountains disappear into clouds that seem almost close enough to touch 【1】. On the plain③ in front of us, we can just make out④ a herd⑤ of graceful⑥ animals. This is why we're here—to observe⑦ Tibetan antelopes. 【2】
【1】enough是程度副词，作状语修饰形容词close，同时引导动词不定式作结果状语。
【2】该句是“This is why...”句型，why引导表语从句。“to observe Tibetan antelopes”是动词不定式，说明“到这儿来”的目的。
Tibetan antelopes live on the plains of Tibet, Xinjiang, and Qinghai. Watching them move slowly across the green grass 【3】， I'm struck by⑧ their beauty. I'm also reminded⑨ of the danger they are in. They are being hunted, illegally, for their valuable fur. 【4】
【3】此处是现在分词短语作时间状语。watch与主语I是逻辑主谓关系，与谓语动词表示的动作同时进行。Watching them move是“watch＋宾语＋宾补”结构，此处表示目睹了藏羚羊穿过草原的全过程，故用不带to的不定式move作宾补。
【4】本句使用了现在进行时的被动语态，hunt与主语They之间是动宾关系。
My guide is Zhaxi, a villager from Changtang. He works at the Changtang National Nature Reserve. The reserve is a shelter⑩ for the animals and plants for northwestern Tibet. To Zhaxi, the land is sacred? and protecting the wildlife 【5】 is a way of life. “We're not trying to save the animals，” he says. “Actually, we're trying to save ourselves.”
【5】“protecting the wildlife”是v.-ing短语作主语，谓语动词应用单数形式。
The 1980s and 1990s were bad times for the Tibetan antelope. The population dropped by? more than 50 percent. Hunters were shooting antelopes to make profits? 【6】. Their habitats were becoming smaller as new roads and railways were built 【7】．
【6】不定式to make profits作目的状语。
【7】此处是as引导的时间状语从句，as在此表示“随着……”。
In order to save this species from? extinction, the Chinese government placed it under national protection?. Zhaxi and other volunteers watched over? the antelopes day and night? to keep them safe from attacks? 【8】. Bridges and gates were added to let the antelopes move easily and keep them safe from cars and trains.
【8】此处是不定式短语作目的状语。“keep them safe from attacks”是“keep＋宾语＋宾补”结构，形容词safe作宾补。
The measures were effective?. The antelope population has recovered? and in June 2015, the Tibetan antelope was removed from the endangered species list. The government, however, does not intend to stop the protection programmes, since the threats to the Tibetan antelope have not yet disappeared 【9】．
【9】此处是since引导的原因状语从句，since表示“因为”。
In the evening, I drink a cup of tea and watch the stars. I think about the antelopes and what Zhaxi told me. Much is being done to protect wildlife, but if we really want to save the planet, we must change our way of life. Only when we learn to exist in harmony with nature can we stop being a threat to wildlife and to our planet. 【10】
【10】“only＋状语(从句)”位于句首时，主句要用部分倒装结构，即将be动词、助动词或情态动词提到主语的前面。
