Fallak法拉克
fallv.落下;倒下;来临n.秋天;落下;瀑布
fall off the staircase摔下楼梯
falling characteristic降落特性
fall into a deep sleep酣睡
falling-film reactor降膜式反应器
falling ball viscosity落球粘度
fallen all over myselfv.跌倒(极想)
fall into company withv.偶然结识
fall among Philistines大吃苦头, 倒大霉
fall into contact with同
fall into a difficulty陷入困难