pref. 困难
先理解核心含义，再看它在真实句子里的用法。
pref. 困难；障碍
An inseparable prefix, fr. the Greek / hard, ill, and；signifying ill, bad, hard, difficult, and the like; cf. the prefixes,；Skr. dus-, Goth. tuz-, OHG. zur-, G. zer-, AS. to-, Icel. tor-, Ir.；do-.
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pref. 困难；障碍
An inseparable prefix, fr. the Greek / hard, ill, and；signifying ill, bad, hard, difficult, and the like; cf. the prefixes,；Skr. dus-, Goth. tuz-, OHG. zur-, G. zer-, AS. to-, Icel. tor-, Ir.；do-.
Use dys- naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
Dictionary facts from ECDICT.