It does so at the expense of heavy flight instruments, sensors and shields.

为此，它牺牲了厚重的飞行仪表、传感器和护盾。

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Not many flight instruments existed that could help him find his way.

VOA: special.2009.03.18

Jimmy Doolittle's test flight had shown that instruments could help pilots fly.

VOA: special.2011.04.20

Flight instruments now warn pilots about potentially hazardous terrain and weather conditions.

NPR: For Air Travelers, More Safety and More Problems

While there's no video of this particular test flight, there is a video of the instruments being loaded onto the aircraft, shot with the very camera that's now installed vehicle's tail (and augmented with the requisite Benny Hill theme song).

ENGADGET: NASA's unmanned Global Hawk completes key test flight

While the aircraft has flown before, this was the first flight for it after being loaded up with eleven different scientific instruments, which will be used to examine trace gases, aerosols, and dynamics of the upper troposphere and lower stratosphere.

ENGADGET: NASA's unmanned Global Hawk completes key test flight