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[ti'neiʃəs]

adj. 牢牢不放的,坚定的 

拆分: -ten-握,持有 + -acious形容词词尾

例:
a tenacious revolutionary spirit 顽强的革命精神 
be tenacious in defense 坚守 
be tenacious of life (动物)生命力强的 
be tenacious of one's opinion 固执己见 
a tenacious memory 很强的记忆力 
tenacious clay 粘土