噪声 zàoshēng noise
How to remember 噪声: 噪 to be noisy + 声 voice = noise.
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How it is used
- Noise - unwanted sound - 噪声污染 (zàoshēng wūrǎn) noise pollution; also 'noise' in a signal.
- Near-synonym 噪音 (zàoyīn) is the more everyday word; 噪声 leans technical/acoustic.