... roughened surface 粗面 ; 粗糙面 roughened can 粗糙表面包壳 roughened surface glass fibre 糙面玻璃纤维 ...
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His design incorporates a downward-angled port where bats can enter, leading to a 34mm-wide chute with roughened timber walls which they can crawl up to gain access to an attic 10.5m long and 3m high at the apex.
CNN: Architects building dream homes for bats
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