The tumor cells produce a whole range of proteases that degrade the proteins of the extracellular matrix that hems them in, part of which is the basement membrane.

这些肿瘤细胞产生了一整系列的蛋白酶，能降解包围它们的细胞外基质蛋白，这也是部分的基底膜。

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In this paper, the approximate perturbation range of the state matrix of a linear time-invariant system is given, keeping the system controllability invariant.

本文给出了线性定常系统状态矩阵摄动时保持能控性不变的摄动区间的估计。

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Telecoms Market Matrix is updated on a quarterly basis, and can be used to support a wide range of commercial and regulatory decisions.

通信市场母体数据各季皆进行更新，在商业及规制面的决策上都能有广泛的活用。

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