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30－Exploring the Sea-Floor
lijiao 314
29－The Hovercraft
lijiao 463
29－The Hovercraft
lijiao 315
28－Patients and Doctors
lijiao 342
28－Patients and Doctors
lijiao 258
27－The vasa
lijiao 1318
27－The vasa
lijiao 213
26－The Past Life of the Earth
lijiao 146
26－The Past Life of the Earth
lijiao 289
25－Non-Auditory Effects of Noise
lijiao 285
25－Non-Auditory Effects of Noise
lijiao 171
24－Beauty
lijiao 189
24－Beauty
lijiao 200
23－Bird Flight
lijiao 247
23－Bird Flight
lijiao 289
22－Knowledge and Progress
lijiao 278
22－Knowledge and Progress
lijiao 169
21－William S. Hart and the Early Western Film
lijiao 419
21－William S. Hart and the Early Western Film
lijiao 241
20－Snake Poison
lijiao 165