Through-type Narrow Slit Porous Brick 直通狭缝式透气砖
narrow slit die 窄缝模具
narrow slit scatterer 微缝散射体
narrow entrence slit 窄入射缝隙
narrow eyes into a slit 眼睛眯成一条缝
It is well known that narrow slit may be used as acoustical element.
窄缝可做为声学原件，这是已知的。
The exact formulae of the acoustical impedance of a narrow slit and its low-frequency approximation are available.
窄缝的声阻抗严格公式以及低频近似公式都存在。
Cover the flat shovel by a wiping cloth dipped in diluted detergent, clean out the dust and dirt in the narrow slit of the air outlet.
将平头铲用抹布包裹起来浸湿稀释的清洁剂，用它莱清洁出风口的窄逢。
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