If an interactive computer screen is to match a whiteboard in usefulness, it must be viewable from arm's length as well as from across a room.
如果一个交互式计算机屏幕要在实用性上与白板相匹配，它必须在手臂长度范围和横跨房间范围内是可视的。
When the computer was just a screen, keyboard and mouse, it remained, for all its usefulness, a tool. A means to an end.
在电脑只是显示屏、键盘和鼠标的时候，虽然非常有用，但只是一个工具。
Objective: to document the surgical technique and usefulness of computer-assisted surgery for spinal osteotomy.
目的：记录此外科技术和计算机辅助下行脊柱截骨术的有效性。
Hence, Computer Science should focus on usefulness criteria and reject other criteria.
因此，计算机科学应该集中研究可用性而不是别的什么东西。
Hence, Computer Science should focus on usefulness criteria and reject other criteria.
因此，计算机科学应该集中研究可用性而不是别的什么东西。
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