bell-mouthed opening

• 喇叭口

bell-mouthed opening的用法和样例：

例句

1. A valved brass wind instrument that produces a mellow tone from a long, narrow tube that is coiled in a circle before ending in a flaring bell.
   一种有活瓣的铜管乐器，从漩涡形且端部有喇叭口的又长又细的管子里发出圆润的乐音。