慢速英语:早期人类与穴居人的生活谁更艰难
日期:2018-11-21
Words in This Story
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extinct – adj. no longer existing
stressful – adj. full of or causing stress : making you feel worried or anxious
evolution – n. a theory that the differences between modern plants and animals are because of changes that happened by a natural process over a very long time
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