検索内容:
the Paleoproterozoic era
The Paleoproterozoic era was a very important period in the history of the Earth.
the Mesoproterozoic era
Where does the Mesoproterozoic era fit in the history of the Earth?
time for doing something / period of time / season
What is the best time to travel?
the Proterozoic eon
The Proterozoic eon is the longest era in the history of the Earth.
important, significant
Health is very important.
importance, consequence, significance
His opinion is very important.
extraordinary, unusual
I was amazed at his extraordinary talent.
emergency
Please press this button in case of emergency.
very; extremely / exceedingly; tremendously
It is a very beautiful view.
history / the study of history
He is interested in history.
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