Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
advanced – adj. having developed more than others
defects – n. a physical problems that cause something to be less valuable, effective, healthy, etc.
hormones – n. natural substances produced in the body that influence the way the body grows or develops
insurance – n. an agreement in which a person makes regular payments to a company and the company promises to pay money if the person is injured or dies, or to pay money equal to the value of something such as a house or car if it is damaged, lost, or stolen
mutation – n. a change in a gene or the resulting new trait it produces in an individual
nails – n. the hard coverings at the end of fingers or toes; fingernails or toenails
pill – n. a small, rounded object that you swallow and that contains medicine, vitamins, etc.
tumor – n. a mass of tissue found in or on the body that is made up of abnormal cells
