尼日利亚成为非洲与亚洲非法交易穿山甲的中心

scale – n. one of many small thin, bony objects that cover the bodies of some animals

mammal – n. an animal that feeds milk to its young and that usually has hair covering most of its skin

watchdog – n. a person or organization that makes sure that companies or governments are not doing anything illegal or wrong

vulnerable – adj. open to attack, harm, or damage

commercial – adj. occupied with or involving business