DictionaryForumContacts

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to phrases
aural null
archit. 消息
earth.sc. 无〔消〕声; 听度为零; 静位; 无声带
space 听觉零点
telecom. 无声; 零听度
aural null: 6 phrases in 4 subjects
Astronautics2
Space2
Technology1
Telecommunications1