点击下方单词,选择对的这个单词
点击下面链接下载与本句相关的学习资源，包括PDF教材和音频练习，方便课后复习：
名词
1. the practice of cooperating
e.g. economic cooperationthey agreed on a policy of cooperation
2. joint operation or action
e.g. their cooperation with us was essential for the success of our mission
多通过句子记忆单词，而不是单独死记硬背。
