撕裂度：把一张事先切一小口的纸，撕开到一定长度所需的力，以毫牛顿计算。
Tear strength: it is the force required to tear a paper at a precut edge to a specific length and measured in milli-newton.
撕裂度：把一张事先切一小口的纸，撕开到一定长度所需的力，以毫牛顿计算。
Tear strength: it is the force required to tear a paper at a precut edge to a specific length and measured in milli-newton.
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