重點講解：
1. a staple of 主要部分；重要內容；
Political reporting has become a staple of American journalism.
政治新聞已成為美國新聞報道的主要內容PyLeOqdr_#。
2. be better at 更擅長；
Cultures that were better at trading saw a concomitant increase in their wealth.
比較擅長貿易的文明其財富也隨之增長eOQ4dY&ljOEA8F。
3. distinguish between 區分；辨別；分清；
At what age are children able to distinguish between right and wrong?
兒童到什么年齡才能明辨是非？
4. no matter 不管…；無論…；
No matter where his business took him, he always managed to be home for Thanksgiving.
不管因生意關系去了什么地方，他總要趕回家過感恩節#^x9[4HCib@v。