机器飞虫（被称为扑翼机）扑打的翅翼非常纤薄、轻质，却很牢固。
The flapping wings of the hovering robotic insects (known as ornithopters) are very thin, lightweight and yet strong.
起初给扑翼机接上一个直流电源之后，他们发现这个装置的有效载荷为1.5 g，这大概可以勉强提起飞行所需的电池。
Having initially connected the ornithopter using a DC power source, they realized that the device could lift 1.5 grams of payload, which was roughly the mass of the batteries required for flight.
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