【上位】 a complex or critical or unusual difficulty; "the dangerous situation developed suddenly"; "that's quite a situation"; "no human situation is simple" 複雑で、危機的でまたは普通でない困難さ。
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【上位】 an event that occurs at a critical time; "at such junctures he always had an impulse to leave"; "it was needed only on special occasions" 肝心な時に起こるでき事。
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