重點講解：
1. one another
互相；
eg. The two countries do little trade with one another.
兩國之間很少有貿易往來。
eg. We all try and help one another.
我們都盡力互相幫助。
2. as a matter of fact
確切地說；事實上；恰恰相反；
eg. It's not that difficult. As a matter of fact, it's quite easy.
這并不那么困難，實際上，容易得很。
eg. As a matter of fact, I didn't have anything.
事實上，我什么也沒有。
3. period of time
時段，一段時間；
eg. The bar was formed by the mud and sand deposited here over a long period of time.
河里的泥沙淤積在這里，年深日久便成了沙洲。
eg. The money was lent for an undefined period of time.
這筆錢無限期借出。

背景資料：
2005年11月16日，在世界影壇被譽為“超級硬漢”的阿諾德·施瓦辛格來到清華大學發表演講。屆年58歲，時任加州州長的施瓦辛格依然風度翩翩，一上場就博得了熱烈的掌聲。以“執著于你的夢想”為主題，施瓦辛格與學生們暢談理想，并分享自己的成長故事。他說自己在追逐夢想的過程中，常受到一些人的嘲諷和質疑，但他沒有因此動搖，始終堅持通過自己取得的每一點進步去改變生活、改變未來。他的這種“執著于夢想”的精神是否讓我們的目標更加堅定呢？

名人經典：
Some of your families maybe don't believe in your dreams. But let me tell you something my young friends. Keep your dreams. No matter what, keep your dreams. Don't give up on them, even when you are temporarily defeated or denied. Keep your dreams.
你們的家人也許不相信你們的夢想，但是，年輕的朋友們，讓我告訴你們，執著于你們的夢想！無論如何，堅持你們的夢想。即使你們遭遇暫時的失敗或被否定，也不要放棄你們的夢想。執著于你們的夢想。