求翻译：It is clear that early postmortem events　including　 rate and extent of pH decline, proteolysis and even protein oxidation are key in influencing the ability of meat to retain　moisture. Much of the water in the muscle is entrapped in structures of the cell, including the intra- and extra　myofibrillar spaces;therefore, key changes in the intra　cellular architecture of the cell influence the ability of muscle cells to retain water. As rigor progresses,the space for water to be held in the myofibrils is reduced and fluid can be forced into the extra　myofibrillar spaces where it is　more easily lost as drip. Lateral shrinkage of the myofibrils occurring during rigor can be transmitted to the entire cell if proteins是什么意思？

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