重点讲解：
1. come from
来自；始于；
eg. Chocolate comes from the cacao tree.
巧克力出自可可树dpW2,*cn4cU*K+IyO*。
eg. The term 'claret', used to describe Bordeaux wines, may come from the French word 'clairet'.
用来指称波尔多葡萄酒的词 claret 可能源于法语单词 clairet^e;!g&wqahtB=zR。
2. originate from
来源；起源；
eg. All carbohydrates originate from plants.
所有的碳水化合物均来自植物JVEL)3]qEKsavsi5E。
eg. The rhythms of jazz music originate from African tribal music.
爵士乐的节奏起源于非洲的部落音乐G%_NvDBq.%B;rczSA&T。
3. as far as I know
（用于表示不太确信）据我所知；就我记得的；
eg. It only lasted a couple of years, as far as I know.
据我所知，它仅仅维持了两三年A89Il0UDeF!c。
eg. So far as I know, she has a faculty of housekeeping.
就我所知，她很善于理家Ux,PGdn9UL。