Suppressing unneeded navigation elements.

去除不需要的导航元素。

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As the user digs deeper into the site, more navigation elements display.

随着用户对站点的深入访问，此时可以显示更多的导航元素。

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It reduces the number of traditional navigation elements that are necessary (i.e. fewer buttons help to avoid a cluttered interface).

减少了传统导航条必须元件的数量(换言之，更少的按钮有助于避免用户界面的杂乱无章)。

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To cut down on clutter and give the feed more room to breathe, navigation elements on the left have been slimmed down to a narrow black column of icons, similar to the mobile interface.

CNN: Facebook revamps site, tweaks mobile apps

As the passage implies, even something as seemingly simple as an airplane flying in the sky is actually just one part of a large sociotechnical system composed of various human and machine elements, from the pilot and airplane to a series of airports, communication and navigation systems, bureaucracies, regulations, rules and norms of flight, and more.

FORBES: A Domain Like Cyberspace