This paper introduces mechanism, research methods and main results about microbubble dray reduction.该文介绍了微气泡降阻机理 、 研究方法和重要结论.A dray is a type of horse - drawn vehicle.雪橇是一种马拉的交通工具.She stood doggedly in checkout lines; sh...
Unauthorized vehicles will be wheel clamped or towed away.未经许可停放的车辆将会被轮夹锁住或拖走。Nations react strongly to unauthorized overflights.各国对未经授权的飞越领空行为都会作出激烈反应。No access for unauthorized personnel.未经允许不得入内。...
他们全都光着脚走过潮湿的沙地来到水边。They all walked barefoot across the damp sand to the water's edge.南希一直跑啊跑，穿过沙地。Nancy kept running, plunging through the sand.沙地足迹footprints in the sand...