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natural period
auto. 自然固有周期
el. 自由振荡周期
eng.geol. 自振周期
met. 固有周期; 自然周期
natural period: 23 phrases in 9 subjects
Agriculture2
Bridge construction4
Chemistry1
Desert science1
Economy2
Hydroelectric power stations1
Nautical3
Technology8
United Nations1

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