慢速英语:National Parks Week Features Free Park Entry

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1. celebrate vt.庆祝; 祝贺; 举行宗教庆典
例句：How did you celebrate May Day this year?
你们今年是怎样庆祝五一节的？

2. volunteer n.志愿者，志愿兵
例句：She often does volunteer labour during holidays.
放假时她常去参加义务劳动。

3. establish vt.建立，创建; 确立或使安全
例句：He is planning to establish a home.
他正计划建立家庭。

4. defense n.(D-) （美国）国防部，防卫
例句：The defense was overwhelmed by superior numbers.
防守被优势的兵力摧垮了。