challenger
n. 挑战者；需要全力对付的事物
近义词：contender，competitor，competition，rival，contestant，opponent，pretender，defender，
英英释义
Noun
- the contestant you hope to defeat;
"he had respect for his rivals" "he wanted to know what the competition was doing"
例句
用作名词(n.)
- The champion and the challenger meet next week.下星期冠军将迎战挑战者。
- The champion, within striking distance, gave the challenger a severe blow.拳王站在打击得到的距离内，给挑战者一记重击。