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an earthquake
There was a big earthquake yesterday.
activity, work, operation
We participated in the local cleaning activity over the weekend.
earthquake
Yesterday, a big earthquake occurred.
(obsolete) an earthquake
a piece of research, a study, investigation
He is conducting research on a new energy source.
to research, to study
He is researching about a new energy source.
to act, to operate, to work
We are actively participating in local activities.
scholarship; learning; knowledge
He is known as a person with learning.
(geology) plate tectonics
I learned about plate tectonics in geology class.
importance
It is important to understand the importance of health.
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