acoustic
adj
əˈkuːstɪk
adj
1
relating
to
sound
and
the
way
people
hear
things
声音的; 听觉的
2
an
acoustic
GUITAR
or
other
musical
instrument
does
not
have
its
sound
made
louder
electronically
〔乐器〕原声的，不加电子设备传声的;