1. I, I have my groundwork in society. I have friends from before. 我啊，我因为原来有社会基础，就是以前自己有朋友。
2. We have laid a lot of groundwork, and helped China to implement its own strategy. 我们已经做了许多基础工作，同时也帮助中国实施自己的战略。
3. Truss is important part of all kinds of engineering equipment and groundwork establishment. 桁架结构是各类工程设备、基础设施的重要组成部分。
英英解释
n.
1. the fundamental assumptions from which something is begun or developed or calculated or explained
2. lowest support of a structure
3. preliminary preparation as a basis or foundation
