When you work at a computer, the keyboard should be at elbow height, so your upper and lower arms form an Angle of 90 degrees or more and your forearms are supported by armrests.
2
你沉浸于手头的事，身体向办公桌和电脑前倾，双臂放在椅子的扶手上或者桌子上。
You're absorbed in whatever you're doing, leaning into your table and toward your computer, with arms placed either on the chair's armrests or on your desk.
3
你需要同时使用笔记本电脑和手机时，需要桌面或椅子提供一个舒适的扶手。
You're using your laptop and your phone at the same time. This requires good arm rests, provided by either tabletop or chair.
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