remain silent
bored; close; cover tightly; depressed; in low spirits; stuffy
make a sound; reputation; sound; tone; voice
【化】 sound
【医】 phon-; phono-; sonus; sound
nay; no; non-; nope; not; without
【医】 a-; non-; un-
ding; echo; noise; noisy; ring; sound; strike
【机】 ring