qualifying and challenging
排位赛和挑战
以上为机器翻译结果，长、整句建议使用 人工翻译 。
They are also battling for fourth qualifying spot for the Champions League from the Premier League and face a challenging month.
CNN: Fabregas boosts Arsenal after injury layoff
While it is a physically demanding job, requiring broad aviation experience, several unique qualifying duty assignments and very specialized training, it remains one of the most challenging and rewarding jobs in the Navy.
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