词汇讲解：
1. lack vt. 缺乏; 缺少
例句：I lack words with which to express my thanks.
我无法以言语来表达我的感激之情。
2. either adv. (否定句中)也
例句：The product is of high quality and is not expensive either.
这种产品质量好价格也不贵。
3. undesirable adj. 令人不快的,不受欢迎的;讨厌的
例句：Big cuts in education are very undesirable.
教育经费的大幅度削减是极不受欢迎的。
4. outweigh vt. 在重要性或价值方面超过
例句：Her need to save money outweighs her desire to spend it on fun.
她省钱的需要比她花钱娱乐的愿望更重要。
5. survive vi. 幸存, 活下来
例句：These plants cannot survive in very cold conditions.
这些植物在严寒中不能存活。
6. eradicate vt. 摧毁,完全根除,消灭,杜绝
例句：The disease has been eradicated from the world.
这种疾病已在全世界得到根除。
7. dense adj. 密集的, 稠密的, 浓密的
例句：We entered a dense forest.
我们进入一片浓密的森林。
8. transport vt. 运送; 流放
例句：A bus transported us from the airport to the city.
一辆公共汽车把我们从飞机场送到城里。
9. bury vt. 掩埋, 埋藏
例句：The old man is burying his money.
老头正在埋藏他的钱。
10. graze v. (让动物)吃草; 牛、羊等（在草地上）吃青草
例句：The cattle are grazing in the field.
牛群在田野上吃草。
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