Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
viable – adj. capable of succeeding
volume – n. an amount of something
infrastructure – n. the basic equipment and structures (such as roads and bridges) that are needed for a country, region, or organization to function properly
hormones – n. a natural substance that is produced in the body and that influences the way the body grows or develops
antibiotics – n. a drug that is used to kill harmful bacteria and to cure infections
steroids – n. a drug that is sometimes used illegally by athletes to help them become stronger and more muscular and by farmers to help their animals grow larger more quickly
