So, basically, in order to move, a cell climbs hand-over-hand along the extracellular matrix until it reaches a blood or lymphatic vessel and penetrates it. From there, it's smooth sailing.

基本而言，细胞顺着细胞外基质移动，一旦发现血管或淋巴管，穿透血管和淋巴管，这样就畅通无阻了。

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Extracellular matrix is the main composition which constitute blood vessel wall, its balance of metabolism is to suffer the matrix metalloproteinases to regulate.

细胞外基质是构成血管壁的主要成分，其代谢平衡受基质金属蛋白酶的调节。

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