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a Foucault's pendulum
Foucault's pendulum is used to prove the rotation of the earth.
Alternative form of フーコーの振り子 (Fūkō no furiko, “Foucault's pendulum”)
Experiments with the Foucault pendulum help to understand important parts of physics.
understanding, comprehension / appreciation
It's difficult to understand his explanation.
physics (as an area of study)
He is an expert in physics.
benefit (be or provide a benefit to)
This app provides useful information for everyday life.
useless, deadhead, good-for-nothing, a piece of shit / (politics) lame duck
His advice was completely useless.
part, section, segment, portion
It's difficult to solve a part of this problem.
understand, comprehend / appreciate
important, significant
Health is very important.
importance, consequence, significance
His opinion is very important.
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