重点讲解:
1. take on 承担,接受(尤指艰巨工作或重大责任);
例句:He is ready to take on heavy responsibilities.
他乐于承担重担 。
2. refer to 提到,指的是;
例句:It can refer to an academic subject or a practical skill.
这一词既可指某一学科也可指某种技能 。
3. at least (数量)至少,不少于;
例句:Cacao has been cultivated for at least three millennia in Mexico, Central and South America.
在墨西哥及中南美洲,可可树至少已有了三百万年的种植历史 。
adj. 学术的,学院的,理论的
n.