The Young Scientists Level 4 (96) How Do i Get A Good Night's Sleep?

The Young Scientists Level 4 (96) How Do i Get A Good Night's Sleep?
"White noise is a sound that is consistent in frequency and
repeated over a long period of time such as the sound of waves
and rain. It is good for silencing distracting sounds such as the
barking of dogs and noisy cars passing by."

關鍵字詞: STEM | SCIENCE | English

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