Operating on the assumption that other barrier organs such as the lung will understand this alarm, the researchers tested what happened when the mice with skin defects inhaled an allergen.

通过假设其它的屏障器官如肺能理解这个警告，研究者们试验了皮肤缺陷的小鼠在吸入变应原时会发生什么情况。

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He defended Illinois' efforts to block the advance of silver and bighead carp toward the lakes by hiring commercial fishermen and operating an electric barrier, but acknowledged more needs to be done.

NPR: Gov. Quinn Open To Great Lakes-Mississippi Split

The back four defended well as a unit, operating close together, covering each other and forming a barrier which was rarely pierced.

BBC: Battle of the continents