犬难产的手术助产 Progress in Veterinary Medicine
犬难产的简易取胎法 Animal Husbandry & Veterinary Medicine
产生难闻的气味 produce terrible gas
产生灾难性的影响 exert a disastrous effect on ; exert t a disastrous effect on
生产的难易程度 Difficulty or Facility of Production
很难证明的产品 Hard proof of product
灾难中产生的爱 Disasters resulting in love
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