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• Vocabulary 加入 11:24
• Sentence patterns
• Sentence patterns 加入 07:11
• Difficult sentences
• Difficult sentences 加入 05:58
• Sentence translation
• Sentence translation 加入 04:54
• Unit 5 Sports and recreation
• Background
• Background 加入 10:13
• Structure
• Structure 加入 16:37
• Vocabulary
• Vocabulary 加入 20:32
• Sentence patterns
• Sentence patterns 加入 11:33
• Difficult sentences
• Difficult sentences 加入 11:27
• Sentence translation
• Sentence translation 加入 13:58
• Unit 6 Engineering and society
• Background
• Background 加入 06:02
• Structure