在你能够开始教别人你所知的东西前需要在社会中去实践你的知识。
You need to test your knowledge out in the world before you can start teaching others what you know.
我希望在70岁前能成为社会中有所作为的一份子。
10年前，很少有人听说过“社会企业家”这个字眼。
TEN years ago, few people had heard the term "social entrepreneur".
对此，社会学家早在一百年前就已知晓。
老师要求我们下星期五前缴交社会研究报告。
The teacher asked us to hand in the social studies report next Friday.
老师要求我们下星期五前缴交社会研究报告。
The teacher asked us to hand in the social studies report next Friday.
应用推荐