动词短语
中文翻译：加入战斗
同义词：
['engage', 'take part in', 'volunteer for']
例句：
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1. He decided to join the army and serve his country.
他决定参军为国家服务。
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2. She volunteered for a charity event last weekend.
她上周末为一个慈善活动做志愿者。
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3.The soldier bravely joined the front line to fight the enemy.
这位士兵勇敢地加入了前线与敌人作战。