名词
中文翻译：Unknown
同义词：
['maintain', 'preserve']
例句：
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1. The team's tenacious defense kept the opponent from scoring.
球队的顽强防守让对手无法得分。
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2. He tenaciously pursued his dream of becoming a doctor.
他坚持不懈地追求成为一名医生的梦想。
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3. The old man tenaciously clung to life despite his advanced age.
这位老人尽管年事已高，却顽强地保持着生命。