Besu贝苏bev.有；在；是；到达；拜访be ground ed upon以 ... 为基础be debilitated by因 ... 而衰弱be in full vigour精力旺盛be slightly built(建筑物等)不牢固的; (体格)瘦弱的, 苗条的beharioral theory行为理论be short of coins钱荒be strong for sth坚决赞成某事物be at the root ofvt.是 ... 的根本be unbecoming for对be neatly dressed衣着整洁