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30－Exploring the Sea-Floor
lijiao 321
29－The Hovercraft
lijiao 471
29－The Hovercraft
lijiao 320
28－Patients and Doctors
lijiao 350
28－Patients and Doctors
lijiao 265
27－The vasa
lijiao 1339
27－The vasa
lijiao 219
26－The Past Life of the Earth
lijiao 153
26－The Past Life of the Earth
lijiao 295
25－Non-Auditory Effects of Noise
lijiao 291
25－Non-Auditory Effects of Noise
lijiao 176
24－Beauty
lijiao 198
24－Beauty
lijiao 207
23－Bird Flight
lijiao 254
23－Bird Flight
lijiao 297
22－Knowledge and Progress
lijiao 284
22－Knowledge and Progress
lijiao 176
21－William S. Hart and the Early Western Film
lijiao 437
21－William S. Hart and the Early Western Film
lijiao 248
20－Snake Poison
lijiao 174