simulation n. (用实验、仪器等的)模拟
animal right activists 动物权益保护主义者
medical research 医学研究
cruel/merciless/inhuman/callous/brutal adj. 残忍的
vivisection n. 活体解剖
anesthetic n. 麻醉
relieve/alleviate/ease animal's pain 减轻动物的痛苦
pets are their masters'companions 宠物是主人的伙伴
afford their masters consolation and comfort 给主人心理安慰
poach v. 偷猎
there are no replacements/substitutes/alternatives for sth. 某一种事物是没有替代物的