The mechanism of this anomalous vascular response is unknown.此种不规则的血管反应的机制尚不清楚.Male - sterility mainly results from the abnormality of mesospore, tapetum tissue and vascular bundle.中层组织 、 绒毡层组织及药隔维管束异常均是雄性败育的因素.Objective...
经理的字迹很难辨认.It was difficult to make out the manager's handwriting.由于地址字迹不清,致使信件无法投递.It is impossible to deliver this letter because the address is illegible.我收到了他一封字迹工整的信件.I received a letter from him in his neat scr...