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地震前兆 dìzhèn qiánzhào
bridg.constr. earthquake precursor
eng.geol. earthquake premonitory phenomenon
hydroel.st. premonitory symptom
oil preliminary symptoms
tech. preliminary symptom; premonitory symptoms; seismic precursor
地震前 兆
: 3 phrases in 3 subjects
Desert science1
Electronics1
Oil / petroleum1