effort
目標を達成するための努力
effortより堅く持続的な懸命な努力
たやすく成功するような目標には用いない
exertion
骨の折れる努力
体力や気力の消耗を伴う激しい努力
He is making effort at becoming a teacher.
She made every endeavor to win his friendship.
Physical exertion that makes one's features beautiful.
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