According to the Standard Encyclopedia dictionary (1966 p.288,) semantically it means "turning out to be unsuccessful, disappointing or lacking" while in Collins (1989, p.151) it relates to being "below the required standard".
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disappointing or lacking
令人失望的或缺乏的
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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