| 词汇 | hard-tough-nut-to-crack |
| 释义 | a hard/tough nut to crackidiom a problem that is very difficult to solve or a person who is very difficult to understand棘手的问题；难以理喻的怪人 Difficult things and people a (heavy) cross to bearidiom albatross ball and chain bane be dead meatidiom be in the clearidiom bump chill equation hiccup hindrance hot potato impediment incubus nut snag stumbling block teaser teething troubles thorn in your flesh/sideidiom |
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