His hat was a vast ruin with a wide crescent lopped out of its brim ; his coat , when he wore one , hung nearly to his heels and had the rearward buttons far down the back ; but one suspender supported his trousers ; the seat of the trousers bagged low and contained nothing , the fringed legs dragged in the dirt when not rolled up 他的帽子很大很破，边上有一块月牙形的帽边子耷拉着。他要是穿着上装的话，那上装就差不多拖到他的脚后跟，背后的两排并的扣子一直扣到屁股裤子却只有一根吊带裤子裆部像个空空的口袋似地垂得很低。裤腿没有卷起的时候，毛了边的下半截就在灰土里拖来拖去。
As the strong normal share of the wind , turbulent fluctuation is strengthened and the sands are raised up from the surface ground the wind speed in the atmosphere of the low level has a horizontal share and this pushes the sands in the atmosphere aggregate , so the visibility descend 近地面风速的垂直切变和地面热通量的加大，都可使使边界层湍流加强扬起地面沙尘。地面锋区附近风场的强水平切变，锋面垂直环流及锋后斜压转换的作用，将地面卷起的沙尘带到高空，爆发强沙尘暴。
Once or twice of a night we would see a steamboat slipping along in the dark , and now and then she would belch a whole world of sparks up out of her chimbleys , and they would rain down in the river and look awful pretty ; then she would turn a corner and her lights would wink out and her powwow shut off and leave the river still again ; and by and by her waves would get to us , a long time after she was gone , and joggle the raft a bit , and after that you wouldn t hear nothing for you couldn t tell how long , except maybe frogs or something 每天晚上，我们总有一两回看到一只轮船轻手轻脚在暗地里溜过去，从烟囱里喷出一大簇火花来，象雨点般地落在水面上，煞是好看。然后它拐过一个弯，灯不亮了，吵闹声停下来了，留下的是一片寂静的大河。轮船卷起的水浪，在它开走以后好久才流到我们的面前，把木筏轻轻摇动几下。
