重點講解：
1. off the top of one's head
不加思索地；來不及思索地；
eg. It was the best I could think of off the top of my head.
這是我一時所能想到的最好的辦法#V]p5=YDIPy7aii。
eg. Jane can tell you the correct amount off the top of her head.
簡可以一下子把準確的數量告訴你LXBuPP|LkC%R=10。
2. on one's own
獨立地；依靠自己地；
eg. John quit his job and struck out on his own as a traveling salesman.
約翰辭掉工作去做旅行推銷員，獨立闖新路V26Z|#jEzRLJ[#8BHI。
eg. I'm well able to manage on my own.
我完全能夠獨自處理dd#YxmJ5hJe;lf32c&k。
3. quite a bit
相當多，很多；
eg. He has got quite a bit salted away .
他攢了不少錢l_h^#2_lIA9VO]A3d。
eg. He has knocked about quite a bit.
他經歷過很多漂泊不定的生活8vKlt^Bv*N。