Onshape lesson1 Summary(第一課摘要) Let’s take a second to reflect what we learned in this lesson. 1. We learned about the sketch-based modeling and the 4 foundational features (extrude,revolve, sweep, and loft). 2. We made our very first sketch. 3. We learned about selecting and deleting sketch entities. 4. We learned about snapping sketch entities to draw more accurate sketches.