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30－Exploring the Sea-Floor
lijiao 336
29－The Hovercraft
lijiao 485
29－The Hovercraft
lijiao 334
28－Patients and Doctors
lijiao 363
28－Patients and Doctors
lijiao 280
27－The vasa
lijiao 1356
27－The vasa
lijiao 232
26－The Past Life of the Earth
lijiao 167
26－The Past Life of the Earth
lijiao 307
25－Non-Auditory Effects of Noise
lijiao 304
25－Non-Auditory Effects of Noise
lijiao 190
24－Beauty
lijiao 210
24－Beauty
lijiao 219
23－Bird Flight
lijiao 268
23－Bird Flight
lijiao 311
22－Knowledge and Progress
lijiao 297
22－Knowledge and Progress
lijiao 190
21－William S. Hart and the Early Western Film
lijiao 451
21－William S. Hart and the Early Western Film
lijiao 261
20－Snake Poison
lijiao 188