VOA慢速英语:美国天主教担忧强生新冠疫苗的道德问题

derived –adj. to take or get from

ethically –adv. involving a question of right or wrong behavior

irreproachable –adj. not deserving criticism or blame; not involving anything wrong

entirely –adv. completely, fully

legitimate –adj. permitted by the rules

refrigeration –n. the process of keeping something cold