介绍了一种加工孔内键槽的新方法和相应的专用工具。不但可用来加工通孔内的键槽，而且还能用来加工盲孔内的键槽或有障碍台肩的孔内键槽等。
The new method for machining keyway in holes and the special tool is presented, with which the keyway not only in blind holes but also in shoulder holes can be machined.
“宁静”号节点舱的观察台首先是设计给宇航员，用来观察空间站自身外表状态的，但也提供了一个令人惊叹的观察地球和太空的无障碍视野。
But while the view out of Tranquility was primarily designed to give astronauts a way to see the outside of the station itself, it also provides a stunning panoramic view of Earth and space.
一台机器能真正打破语言障碍？
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