guinea-pig
/ˈgɪnɪpɪg; `ɡɪnɪ pɪɡ/ n
1 short-eared animal like a big rat, often kept as a pet 天竺鼠, 豚鼠（常作宠物）.
2 person or animal used in medical or other experiments 供医学或其他实验用的人或动物
localresidents who were unwitting guinea-pigs in the government's nuclear power programme 在政府核电计画中因不知就里而成为实验品的当地居民.