Some day you may be either a speaker or a listenerin a situation involving people from other countries or members of a minority group in North America.
将来有一天，你可能会在面对其他国家或北美少数族裔时演讲或听别人讲话。
2
Be sure to add the listenerin the main method.
确保在main方法中添加一个侦听器。
3
Radio programmes can cost as little as three cents to reach a listenerin Africa.