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Lesson 1: Say who you are
You will learn to introduce yourself and someone else.
A1 · 21 steps · about 12 min
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summer
xiàtiān
A1Beginner
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自然選擇
noun
natural selection
B2
natural selection
zìrán xuǎnzé
B2Upper-Intermediate
Darwin used natural selection to explain how species gradually evolve.