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Official71
对话-生活服务9159
讲座-生态学7795
Fire affect savanna ecosystem
火灾影响热带草原生态系统
0/6
讲座-天文学7482
The discovery of 51 Pegacy B
51 Pegacy B 的发现
0/6
对话-师生讨论7700
讲座-人类学6286
The houses of the Inuit people
因纽特人的房子
0/6
Official70
对话-生活服务12004
information about a previous ski trip
咨询历史滑雪旅行信息
0/5
讲座-生物学10269
To present a theory and an argument that refutes it
某种进化理论的提出，以及反驳的论点
0/6
讲座-艺术类9982
several solutions for a common artistic problem
常见的艺术问题的几种解决方案
0/6
对话-师生讨论9606
concern he has about his major field of study
专业领域的担忧
0/5
讲座-天文学9107
the process of aurora's formation
极光形成的过程
0/6
