词汇讲解：
1. exploit n. 业绩, 功绩, 功勋, 事迹
例句：He performed many daring exploits.
他有过很多英勇事迹。
2. inoculate vt. 给…做预防注射
例句：A pedigree pup should have been inoculated against serious diseases before it’s sold.
纯种狗应该在出售前注射预防严重疾病的针。
3. sickly adj. 有病的;多病的;不健康的
例句：He had a sickly green pallor.
他脸色青白，带有病容。
4. skinny adj. 极瘦的, 皮包骨的
例句：Tom was a lanky boy with long skinny legs.
汤姆是一个腿很�
