6、“if at all”是一个由“if”引起的主谓结构不完整的短句结为“即将……”，“即使……”等。
I can see only with great difficulty,if at all.
There have been opened up to the vast and excellent science,in which my work is the beginning,ways and means by which other minds more accurate than wine will explore its remote corners.
8、“range from …to…”结构。这是一个常见结构，译时很多情况下应变通处理，不能完全依靠辞典上的释义。
Computer applications range from an assembly line completely run by computers to a children toy responding to remote signals.
I always thought she was a common-sense person who discussed things the way they ought to be discussed.
In recent years,the development of sensitive and accurate measuring equipment has made it possible to measure the acuity of hearing of any individual at different frequencies