In order to reduce the expansion stress resulting from cement's expansion and prolong the life-span of porcelain insulator, a thin asphalt buffer layer is coated between the porcelain and the cement.

为了降低水泥膨胀所引起的膨胀应力，延长瓷绝缘子的使用寿命，在胶装时一般在瓷体和水泥之间涂一层沥青缓冲层。

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Besides the Argan tree's various human uses, UNESCO notes, it has had an historical role as a buffer against northern expansion of the Sahara desert.

CNN: Morocco's 'liquid gold' liberates Berbers

They have embarked on the largest expansion programme in many years, and aim for a buffer of 1.5m-2m bpd.

ECONOMIST: The central bank takes stock | The