huge challenge
definitions
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A very difficult task, problem, or situation that requires significant effort, skill, or resources to overcome.ja: 巨大な挑戦
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A significant test of one's strength, ability, endurance, or character.ja: 重大な試練
examples
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The powerful army presented a huge challenge to the defenders of Liangshan Marsh.
強力な軍隊は梁山泊の防衛者にとって巨大な挑戦となりました。
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Climbing Mount Everest is a huge challenge even for the most experienced mountaineers.
エベレスト登頂は、最も経験豊富な登山家にとっても重大な試練です。