词汇讲解：
1. yield n. 产量, 收益
例句：All these have helped raise farm yields steadily.
所有这些都有助于农业产量的稳步提高。
2. primary adj. 首要的; 主要的; 基本的
例句：The primary cause of Tom's failure is his laziness.
汤姆失败的根本原因是懒惰。
3. irrigation n. 灌溉
例句：Irrigation is needed to make crops grow in dry areas.
要使庄稼在干旱地区生长就需灌溉。
4. complicated adj. 复杂的
例句：This is the most complicated case I have ever handled.
这是我所处理过的最为复杂的案子。
5. scarcity n. 不足;缺乏
例句：The scarcity of skilled workers is worrying the government.
熟练工人的缺乏困扰着政府。
6. dump vt. 把…倒空；(倾斜或翻过来)倾倒
例句：Just dump everything over there. I'll sort it out later.
把所有东西都倒在那边，我以后再清理。
7. elevated adj. 升高的,提高的;高的;高层的
例句：Some elevated people favor the new policy.
一些高层人士支持该项新政策。
8. pursue vt. 追逐；追求；从事，进行
例句：He began to pursue an easy and comfortable life.
他开始追求安逸舒适的生活。
9. entrepreneur n. 企业家
例句：The entrepreneur takes business risks in the hope of making a profit.
企业家为追求利润而冒险。
10. individual adj. 个别的, 单独的, 个人的
例句：Students can apply for individual tuition.
学生可以申请个别指导。
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