the weight of the pilot, passengers and payload 飞行员重量，旅客重量，商务载重 the weight of the fuel 燃料重量 flight regulations 飞行条例 ..
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但干电池和燃料电池技术直到最近才取得突破——其重量大大减轻，从而打开了市场的大门。
But batteries and fuel cells have only recently become light enough to open up a large market.
一架飞越大西洋的飞机大约需要携带80公吨的燃料，这约占飞机重量的五分之一。
WHEN an airliner takes off for a transatlantic flight it needs to carry some 80 tonnes of fuel, which accounts for around one-fifth of its weight.
单位设备，包括合金、反应器和燃料电池重量不到100磅。
The unit, including the alloy, the reactor and fuel cell might weigh less than 100 pounds.
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