要获得此类专业的证书，学生必须能够利用电脑设计系统绘制二维和三维的机械产品草图。
In order to receive a certificate in this field, the student must learn how to create two-dimensional and three-dimensional drawings of mechanical objects using computer design equipment.
当然，所有的遗留问题是为什么电脑操作系统的前端设计是如此的复杂。
There are, of course, all sorts of legacy reasons why the front-end design of computer operating systems is so complicated.
大多数的操作系统设计时都是让手机成为桌面电脑的附庸。
Most operating systems were written so the phones could serve as adjuncts to desktop PCs.
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