He died, literally , at the chalkboard at age 83.他过世了, 83岁的时候, 在黑板前.Then one morning we were working math problems at the chalkboard.后来有一天早晨,我和玛丽在黑板上写下了数字题目.The map was drawn on chalkboard with ink - markers.那张地图用记号笔画在一块...
地面是用一些小块的 、 无光的 红绿 大理石铺成的.The floor was a composition of small, shaded redand - green marbles.它们飘得到处都是, 顿使灰暗无光的院子充满一片清香.These dongled everywhere, perfuming the gray courtyard with its shut - in light.将花药筛到无光的 、 具渗透性的纸上, ...
But the strength will reduce asB added over 1.37 at . - %.但当硼含量超过1.37at.-%时,则降低强度和塑性.The results show that the ASB materials are the new PM antifriction materials for aerobat.并且提供批量零件供现场使用,结果表明,该材料完全满足航空使用工况要求,是一种具有广泛应用前...