首先，它们利用太阳。

First, they use the sun.

youdao

它们利用太阳光获取能量(反射的阳光施加小量压力与太阳帆上，进而驱动其前进)，因而无需燃料。

They draw their energy from sunlight (the reflected light exerts a small pressure on the sail, driving it forward) and therefore need no fuel.

youdao

根本用不着画笔，我只利用太阳和地平线，它们自身就能创作图案。

Instead of a brush stroke, I'm using the sun itself, the horizon itself, arranged to create images.

youdao