送交者: wasguru 于 2007-04-30, 14:25:56:

回答: 随机对照意味着把孩子和父母强行拆开 由 HunHunSheng 于 2007-04-30, 14:25:07:

• 动物不读书没法做实验 (无内容) - HunHunSheng (0 bytes) 2007-04-30, 14:36:11 (138240)
  • you can put animals in a confined environment - wasguru (48 bytes) 2007-04-30, 16:16:36 (138279)

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