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They have no practical value in earthquake prevention. They may have practical value in earthquake prevention. They are certain to have practical value in earthquake prevention. The article does not say anything about their practical value in earthquake prevention.
did the earthquake happen the earthquake happened was the earthquake happened the earthquake was happened
Dangers of Earthquakes. Earthquake Belts and Prediction. Earthquake Prediction and Control. Earthquake Engineering in California.
by this earthquake - stricken area this earthquake - stricken area was this earthquake - strcken area this earthquake - stricken area had been
yiyuàn yīyuàn yīyuàng yīyuè
yuǎnyuánede yuányuánder yuǎnyuǎnder yuányuünder
in danger of in memory of in the honour of in search of
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