重点讲解：
1. all over
到处；遍及；
eg. The bank has branches all over the country.
那家银行在全国各地设有分行。
eg. He told the doctor that he felt funny all over.
他告诉医生,他感到浑身不舒服。
2. if it were not for
非真实条件从句；表示“如果没有”、“要不是由于”；
eg. If it were not for this shortcoming, he is a fairly good teacher.
要不是有这一缺点，他本是一个相当好的教师。
eg. If it were not for hope, the heart would break.
人靠希望而生。
3. so far
迄今为止；到目前为止；
eg. I have had no reply from her so far.
我至今没有得到她的答复。
eg. The scientist is doing experiments no one has so far attempted.
科学家们正在作一项迄今为止没人做过的实验。
