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Jyutping ngaang6 gwat1 tau4
Pinyin yìng gǔ tou

Definitions (CC-CEDICT)
  1. resolute individual
  2. a hard nut to crack
  3. tough mission
  4. difficult task
Definitions (CC-CANTO)
  1. (noun) a tough guy
Definitions (Wiktionary)
  1. noun, figuratively
    strong-willed person; person of unyielding character
  2. noun, figuratively
    hard nut; arduous task; tough issue
    • 例如進攻某一運動中之敵,打早了,暴露了自己,給了敵人以預防條件;打遲了,敵已集中駐止,變為啃硬骨頭。
      例如进攻某一运动中之敌,打早了,暴露了自己,给了敌人以预防条件;打迟了,敌已集中驻止,变为啃硬骨头。
      lì rú jìn gōng mǒu yī yùn dòng zhōng zhī dí , dǎ zǎo le , bào lù le zì jǐ , gěi le dí rén yǐ yù fáng tiáo jiàn ; dǎ chí le , dí yǐ jí zhōng zhù zhǐ , biàn wéi kěn yìng gǔ tou .
      For example, in attacking an enemy force on the move, if we strike too early, we expose ourselves and give the enemy a chance to prepare, and if we strike too late, the enemy may have encamped and concentrated his forces, presenting us with a hard nut to crack.
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    硬骨头
    硬骨頭
    • tough
Examples (Wiktionary)
  1. Mandarin
    例如进攻某一运动中之敌,打早了,暴露了自己,给了敌人以预防条件;打迟了,敌已集中驻止,变为啃硬骨头。
    例如進攻某一運動中之敵,打早了,暴露了自己,給了敵人以預防條件;打遲了,敵已集中駐止,變為啃硬骨頭。
    lì rú jìn gōng mǒu yī yùn dòng zhōng zhī dí , dǎ zǎo le , bào lù le zì jǐ , gěi le dí rén yǐ yù fáng tiáo jiàn ; dǎ chí le , dí yǐ jí zhōng zhù zhǐ , biàn wéi kěn yìng gǔ tou .
    • For example, in attacking an enemy force on the move, if we strike too early, we expose ourselves and give the enemy a chance to prepare, and if we strike too late, the enemy may have encamped and concentrated his forces, presenting us with a hard nut to crack.