There was a small opening in between the two cages for intermingling of neighboring animals.

两个笼子之间有一个小的开口，该开口是为了将相邻的动物稠浊在一起。

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Ostracodes are small animals, most of which have a two valved shell.

介形虫是小型动物，其中大部份都具有两瓣的外壳。

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Two methods for determining the airway responsiveness of small animals were established and compared.

比较了两种测定动物气道反应性的方法：整体容积描记法和气道内压法。

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''Careful management of the small population here in Newquay has meant that the time has come to return two animals to their native home.

BBC: Newquay bred Owston's civets flown to Vietnam