the voice is too weak
电话机的声音很小 Phone not loud enough
将噪音的声音保持很小 keep the noise level down
他声音很小，听不清楚。
He uttered little indecipherable sounds.
《柯林斯英汉双解大词典》
我是说这种工具声音不会很大；它发出的声音很小，你得倾身细听。
What I mean is that this tool doesn't speak loudly; it whispers, and you have to lean forward to hear it.
youdao
口袋里的石英发出的声音很小。
The quartz in his pocket made little sound.
应用推荐
模块上移
模块下移
不移动