There are plenty of places around the globe where people have no access to heavy machinery but do know how to deal with wind, sailing and basic mechanicalprinciples.
在世界上有很多地方，人们都无法使用重型机械，但却知道如何处理风力、航行和基本的机械原理。
2
A device that works on mechanicalprinciples.
在机械原理下工作的装置。
3
The strain gage based on mechanicalprinciples is the scratch gage.