他们会透过那扇经受风吹日晒的老木门的缝隙向外张望。They would look out through the cracks of their weather-beaten door.除草剪刀；专门用于修剪缝隙角落里的青草。Grass shears are specially made to trim grass growing in awkward places.他透过帘子之间的缝隙偷看。He peered through a ch...
XPS foamed board, has a perfect closed - pore alveolate structure.XPS挤出聚苯乙烯发泡板材, 具有完美的闭孔蜂窝状结构.An alveolate coordinate system which reflects actual distribution law of shell arrangement was proposed.提出了蜂窝网格坐标系,该坐标系客观反映了炮弹...