1、
The friability explains how portions of the vegetation can break off and embolize.
由于赘生物的易碎,因此极易脱落和引起栓塞.
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2、
And all of a sudden in the twentieth century came the discovery of its fragility and friability.
然而一夜之间，但到了二十世纪，这力量的脆弱被发现。
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