direct demonstration meaning in Chinese

直接阐明

However , in fact , nsltps are extracellular proteins , so there is yet no direct demonstration of an in vivo function . despite their implication in these diverse aspects of plant biology , it is not clear which specific role nsltps play here , because in a given plant , several nsltp genes can be found , and they are often specifically expressed in both time and tissue . also individual nsltp genes are induced under a variety of conditions
目前认为nsltp是定位在细胞壁中的一类蛋白质，没有直接的证据表明它能体内跨膜转运脂类物质，尽管猜测它可能参与多种生理过程，但对于其具体的生物学功能仍不清楚；另外，由于nsltp在不同组织和不同发育阶段的特异性表达以及各个nsltp之间是否存在功能上的互补都为准确确定其功能增加了难度。