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注释：① extinct adj. 灭绝的，绝种的；熄灭的 vt. 使熄灭
例句：
1. If we continue to destroy the countryside many more animals will become extinct.
我们若继续破坏自然环境，将会有更多的动物绝种。
2. Dinosaurs have been extinct for millions of years.
恐龙已绝种几百万年了
② emerge vi. 浮现；摆脱；暴露
例句：
1. Cultural differences also emerge in employee attitudes.
员工的态度也存在文化差异。
2. My sheep and cattle will emerge before your eyes.
风吹草低见牛羊。
③ remains n. 残余；遗骸
例句：
1. The remains of the supper were taken away.
晚餐吃剩的东西被收去了。
2. In the high valleys, there are remains of glaciers, while below them are clear, icy lakes which the glaciers made.
高山山谷里有着冰川的遗迹。在冰川的下游，有一些冰川形成的清澈而冰冷的湖泊。
句子讲解：
1.When the ammonites became extinct, the map of North America looked completely different: to the north, the Canadian Rocky Mountains already existed; to the south, the American Rockies had yet to rise.
【结构简析】这句话中使用了冒号，它分别说明了南边是一个什么样的情况，北边又是什么样的情况，句子的意思很简单。Daisy建议像这样的句式我们可以在写作文的时候，尝试着去这样写，可以给老师非常地道的英文思维。
【参考译文】石菊灭绝后，北美的这块土地看上去已经完全不同：在北边，加拿大的落基山脉开始形成，而南边，美国这部分的落基山脉尚未形成 。
2. So when we go climbing in the Flatirons, we are climbing on really nice handholds, in some cases, handholds that have been formed either by the pebbles in the rock or by zones of fine grained material that are easily removed by erosion the shales and the siltstones.
【结构简析】这句话可不短，我们就抓主谓宾，那就是"we are climbing "。这就是核心句子，其他的部分是说明"handholds"的，以及它的构成情况是怎样的。
【参考译文】所以，我们可以借助这些天然的扶手去攀登这片平顶脊。一般情况下，岩石中的卵石或者成片成片的被侵蚀了的页岩和沙泥岩共同构成这些天然的扶手。
