(a) [C] any of various types of freshwater fish that are good to eat and fished for by anglers 鳟鱼. (b) [U] flesh of such fish as food （供食用的）鳟鱼肉: a piece of smoked trout 一块燻鳟鱼. 
(idm 习语) an old trout => old.
/ traUt; traJt/ n (pl unchanged 复数不变) (a) [C] any of various types of freshwater fish that are good to eat and fished for by anglers 鳟鱼. (b) [U] flesh of such fish as food （供食用的）鳟鱼肉: a piece of smoked trout 一块燻鳟鱼. (idm 习语) an old trout => old.