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预过滤器 yù guòlǜ qì
auto. pre-cleaner
el. fore filter
el.mach. ante filter
nucl.pow. prefilter
预〔前置〕过滤器
gen. forefilter; prefilter
预 过滤器
: 9 phrases in 4 subjects
Space1
Technology6
Telecommunications1
Transport1