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对称 O 形
 对称形
eng.geol. symmetric figure
| 衰减器
 衰减 器
gen. attenuator
 衰减器
gen. dimmer
el. meas.inst. attenuator
eng.geol. compressor
oil attenuation
space pad
tech. attenuater; attenuation pad; attenuating pad

to phrases
对称形 duìchènxíng
eng.geol. symmetric figure
对称 O 形
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