慢速英语:蝙蝠拥有长寿的秘诀吗?
日期:2018-02-19
Words in This Story
mammals – n. animals that produce milk, have hair and have a high body temperature
alternative – adj. another way or possibility
species – n. a group of people or animals that belong together or have some shared qualities
maintain – v. to keep up or protect in an existing state
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