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to phrases
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
Agriculture
2
Bridge construction
4
Chemistry
1
Desert science
1
Economy
2
Hydroelectric power stations
1
Nautical
3
Technology
8
United Nations
1
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