艰难
word B2- difficult; arduous; hard
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那年却失了馆，在家日食艰难。
为了寻找有效的治疗方法，她带领团队开始了艰难的研究工作。
运送茶叶的过程充满了难以想象的挑战，马帮需要在极端恶劣的自然环境中艰难前行。
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