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30－Exploring the Sea-Floor
lijiao 300
29－The Hovercraft
lijiao 451
29－The Hovercraft
lijiao 299
28－Patients and Doctors
lijiao 328
28－Patients and Doctors
lijiao 244
27－The vasa
lijiao 1305
27－The vasa
lijiao 197
26－The Past Life of the Earth
lijiao 134
26－The Past Life of the Earth
lijiao 274
25－Non-Auditory Effects of Noise
lijiao 272
25－Non-Auditory Effects of Noise
lijiao 155
24－Beauty
lijiao 177
24－Beauty
lijiao 186
23－Bird Flight
lijiao 235
23－Bird Flight
lijiao 273
22－Knowledge and Progress
lijiao 265
22－Knowledge and Progress
lijiao 153
21－William S. Hart and the Early Western Film
lijiao 406
21－William S. Hart and the Early Western Film
lijiao 226
20－Snake Poison
lijiao 151