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30－Exploring the Sea-Floor
lijiao 301
29－The Hovercraft
lijiao 452
29－The Hovercraft
lijiao 302
28－Patients and Doctors
lijiao 330
28－Patients and Doctors
lijiao 246
27－The vasa
lijiao 1306
27－The vasa
lijiao 200
26－The Past Life of the Earth
lijiao 135
26－The Past Life of the Earth
lijiao 275
25－Non-Auditory Effects of Noise
lijiao 273
25－Non-Auditory Effects of Noise
lijiao 158
24－Beauty
lijiao 177
24－Beauty
lijiao 188
23－Bird Flight
lijiao 235
23－Bird Flight
lijiao 275
22－Knowledge and Progress
lijiao 265
22－Knowledge and Progress
lijiao 156
21－William S. Hart and the Early Western Film
lijiao 407
21－William S. Hart and the Early Western Film
lijiao 228
20－Snake Poison
lijiao 152