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（单词翻译）
California earthquake drill
Vocabulary
drill
training exercise
the 'big one'
a massive earthquake
fault
break in the earth's crust, which can cause earthquakes
Richter scale
a series of numbers used to measure the strength of an earthquake
long overdue
expected for a long time
seismologist
scientist who studies earthquake
risks
likely dangers
preventable
avoidable
reflex action
automatic behaviour, something done without thinking about it
race
run quickly
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