most difficult period
definitions
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A duration of time characterized by extreme hardship, struggle, or intense challenges.ja: 最も困難な時期
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The most demanding or complex stage within a specific process, sequence, or lifecycle.ja: 最も困難な段階
examples
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The economic recession was the most difficult period for the small business.
景気後退は、その小規模企業にとって最も困難な時期でした。
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The final exam week is often the most difficult period of the semester.
期末試験の週は、しばしば学期の中で最も困難な時期です。