② emerge vi. 浮現；擺脫；暴露
例句：
1. Cultural differences also emerge in employee attitudes.
員工的態度也存在文化差異。
2. My sheep and cattle will emerge before your eyes.
風吹草低見牛羊。

③ remains n. 殘余；遺骸
例句：
1. The remains of the supper were taken away.
晚餐吃剩的東西被收去了。
2. In the high valleys, there are remains of glaciers, while below them are clear, icy lakes which the glaciers made.
高山山谷里有著冰川的遺跡。在冰川的下游，有一些冰川形成的清澈而冰冷的湖泊。

句子講解：

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.

　　【結構簡析】這句話中使用了冒號，它分別說明了南邊是一個什么樣的情況，北邊又是什么樣的情況，句子的意思很簡單。Daisy建議像這樣的句式我們可以在寫作文的時候，嘗試著去這樣寫，可以給老師非常地道的英文思維。

　　【參考譯文】石菊滅絕后，北美的這塊土地看上去已經完全不同：在北邊，加拿大的落基山脈開始形成，而南邊，美國這部分的落基山脈尚未形成 。

　　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.

　　【結構簡析】這句話可不短，我們就抓主謂賓，那就是"we are climbing "。這就是核心句子，其他的部分是說明"handholds"的，以及它的構成情況是怎樣的。

　　【參考譯文】所以，我們可以借助這些天然的扶手去攀登這片平頂脊。一般情況下，巖石中的卵石或者成片成片的被侵蝕了的頁巖和沙泥巖共同構成這些天然的扶手。