問2. 本文によるとAquilaは普通の飛行機といくつかの点で異なるように設計

As the Sun rose over the desert, a crane lifted Aquila onto the dolly structure that would propel it into the sky. The drone has a tremendous wingspan: 141 feet, compared to a Boeing 737's 113 feet. And yet Facebook engineered Aquila to be as light as possible to permit ultra-long flights. Built of carbon fiber, this latest version of the drone weighs only 408 kilograms. A remote control operator activated the dolly, and Aquila began rumbling down the runway. When it reached sufficient speed, Aquila lifted into the air, where it floated up its test altitude of 2, 150 feet and stabilized. On the ground, Facebook's employees were (3)elated; some wiped away tears. "It was this incredibly emotional moment for everyone on the team who's poured their lives into this for two years," Zuckerberg said.
Watching from below, Zuckerberg was struck by Aquila's deliberate, unhurried pace. "It flies really slowly," he said two weeks later, at Facebook's headquarters in Menlo Park, California. "Most times when people are designing planes, they're designing them to get people or things from place to place, so there's no real advantage to moving slowly. But if your goal is to stay in the air for a long period of time, then you want to use as little energy as possible- which means going as slowly as you physically can, while not falling out of the air."

問6. 下線部(4)severaltechnical challengesが指す内容のうち三つを日本語で具体的に答えなさい。

When will a fleet of Aquila drones bring data to the world? Facebook won't say. There are (4)several technical challenges remaining in getting Aquila to reliably fly 90-day stretches. The team hasn't yet implemented solar panels on the prototype- the test flight plane ran using batteries only. The team is still working out how to build batteries with a density high enough to sustain lengthy missions. They also "need to develop more efficient on-board power and communication systems; ensure the aircraft are resistant to structural damage to reduce maintenance costs and able to stay aloft for long periods of time to keep fleet numbers low; and minimize the amount of human supervision associated with their operation," said a project engineer.

The path forward for Aquila isn't totally clear, and it's bound to encounter more bumps along the way. But Zuckerberg is resolute: billions of people who can't access the internet deserve it. A single test flight represents a tiny step toward getting there. But it also gives Facebook a dramatic success to rally around. "I think the future is going to be thousands of solar-powered planes on the outskirts of cities and places where people live, and that's gonna make connectivity both available and cheaper," Zuckerberg says. "And, I think, that can help play an important role in closing this gap of getting more than a billion people online. This is an early milestone, but it's a big one." Zuckerberg smiled. "It's not something you necessarily expect Facebook to do- because we're not an aerospace company," he said. "But I guess we're becoming one."

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