These include custom-made navigation tools and night vision systems.

其中包括定制的导航工具和夜视系统。

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UNIX supports a wide variety of directory-navigation tools.

UNIX 支持各种目录导航工具。

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Navigation tools work better when placed at the top of the page.

放置于网页顶部，导航工具的作用将更好的发挥。

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Other important navigation tools include: the sextant, the astrolabe, the diptych, GPS devices.

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The decision to bring the shuttle down came after one of the orbiter's three key navigation tools -- an inertial measurement unit -- stopped working.

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In addition, they depend on an array of specialty devices, such as audio book-readers, color readers, navigation tools, raised Braille labels, special bar-code scanners, and large-buttoned, voice-enabled MP3 players which are prohibitively expensive.

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