1. What is draft, and for what manufacturing purpose is it mainly used?
什麼是拔模，主要用於什麼製造目的？
Draft is when you add a small angle (1-3°) to any surface so that it may be properly manufactured using Plastic Injection Molding processes. The draft angle is measured between the the surface and the direction of pull.
拔模是指在任何表面上添加一個小角度（1-3°），以便可以使用注塑成型工藝正確脫模。 在表面和拉動方向之間測量拔模角度。
2. Why are small radii common in parts that have been designed for plastic injection molding?
為什麼在設計用於注塑成型的部件中常見小半徑？
Adding small radii to sharp edges allows for the plastic to “flow” better during the molding process, and facilitates easier removal of the part from the tooling after molding.
向尖銳邊緣添加小半徑允許塑料在模製過程中更好地“流動”，並且有助於在模製之後更容易地從工具中移除部件。
3. What is a “Split” feature?
什麼是“拆分”功能？
It is when you cut a single part into multiple parts using a surface or plane.
使用曲面或平面將單個零件切割成多個零件時。
4. Explain a typical use of a Variable in Onshape.
解釋變量在Onshape中的典型用法。
A Variable is used to establish a design parameter, for example the thickness of a plastic part, that may be referenced throughout the design; in multiple features and parts.
變量用於建立設計參數，例如塑料部件的厚度，可在整個設計中參考; 在多個功能和部分。
5. Explain what is going on in the “thickness” entry of the dialog box below:
解釋下面對話框的“厚度”條目中發生了什麼：
We are defining the thickness of the rib feature as an expression, 0.7 X “thk” inches, where “thk” is a previously defined variable in our model.
我們將肋骨特徵的厚度定義為表達式，0.7 X“thk”英寸，其中“thk”是我們模型中先前定義的變量。