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to phrases
at a time
gen. 一度; 曾经; 每一次多少; 同时; 在某个时刻
at a time
: 95 phrases in 22 subjects
Agriculture3
Animal husbandry2
Business12
Commerce1
Construction1
Data processing3
Economy6
Electronics1
Explosives and Explosive Ordnance Disposal4
Finances1
General14
Geophysics1
Informal1
Information technology3
International trade9
Management1
Metallurgy3
Oil / petroleum1
Project management5
Securities5
Sports2
Technology16

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