a. 笛声的, 有凹槽的

Flute \Flute\, v. t. [imp. & p. p. {Fluted}; p. pr. & vb. n.
{Fluting}.]
1. To play, whistle, or sing with a clear, soft note, like
that of a flute.

Knaves are men,
That lute and flute fantastic tenderness.
--Tennyson.

The redwing flutes his o-ka-lee. --Emerson.

2. To form flutes or channels in, as in a column, a ruffle,
etc.


Fluted \Flut"ed\, a.
1. Thin; fine; clear and mellow; flutelike; as, fluted notes.
--Busby.

2. Decorated with flutes; channeled; grooved; as, a fluted
column; a fluted ruffle; a fluted spectrum.