He sat on the edge of an unyielding armchair, a cup of tea in his hand.他坐在一张坚固的扶手椅的椅边上，手里端着一杯茶。He stood unyielding and unafraid against the enemy.他面对敌人,英勇无畏....the troopers, who had to build roads through those unyieldin...
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...