单词：chitin-protein complex
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action ['kʃən] n.行动，动作，作用，活动 boast [bəust] n.v.吹牛 complete [kəm'pli:t] a.完全的，完成的；v.完成 dictate [dik'teit] v.听写，口授 existence [ig'zistəns] n.生存，存在 hatred ['heitrid] n.厌恶，憎恨，
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