recessed ceiling 中文意思是什麼
recessed ceiling
解釋
凹頂棚-
The working environment of the background music speaker is halls / rooms with suspended ceiling, this is why recessed ceiling - mount speakers without rear cowls
背景音樂揚聲器工作的現場環境為有吊頂的室內，故而採用嵌入式、無后罩安裝的吸頂揚聲器。
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