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选修4
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Unit10-Topic Talk
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Unit11-Topic Talk
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Unit11-Writing Workshop
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Unit12-Topic Talk
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steam
n.蒸汽动力;水蒸气
kettle
n.水壶;壶
boil
v.(使)沸腾;煮沸;(用开水)煮;n.沸腾
improvement
n.改善;改进;改进之处
revolution
n.彻底变革;革命
availability
n.可能性