The mailman was greeted with smiles all along the line.那位邮递员所到之处都受到友好的欢迎.The mailman always comes at 9 o'clock.邮递员总是九点钟来.The mailman always comes at 9 o’clock.邮递员总是九点钟来。The mailman just dropped some mail in our box,...
He fixed the towing cradle round the hull.他把牵引支架固定在船体上。a car towing a trailer with a boat on it拖着一辆载有小船的拖车的小汽车The tug is towing three barges.那只拖船正拖着三只驳船....
他们正在悬挂新的路标。They're putting new street signs up.银盘似的月亮悬挂在空中.The silvery globe of the moon hung in the sky.这部影片是用摄影机系在悬挂 式 滑翔机上拍摄的.The film was taken by a camera mounted on a hang - glider....
建立了砂轮的球基渐开螺旋面方程和分度球面螺旋线方程,给出螺旋运动参数、螺旋线导程.The mechanism of grinding internal gear of spherical worm emery - wheel is researched.正圆锥螺旋面是正圆柱螺旋面被同轴正圆锥面截得.The ortho cone helicoid was used interrsect intercept by the ortho con...