Io
/ˈaɪəʊ/1
- Greek Mythology a priestess of Hera who was loved by Zeus. Trying to protect her from the jealousy of Hera, Zeus turned Io into a heifer. Hera sent a gadfly to torture the heifer, which then fled across the world and finally reached Egypt, where Zeus turned her back into human form【希腊神话】艾奥（赫拉的一女祭司, 宙斯所钟爱的少女, 为保护她免受赫拉的嫉妒陷害, 宙斯把她变成了小母牛, 赫拉放出牛虻折磨她, 使她不得不逃到埃及, 此后宙斯恢复了她的人身）。
2
- Astronomy one of the Galilean moons of Jupiter, the fifth-closest satellite to the planet, being actively volcanic and coloured red and yellow with sulphur compounds (diameter 3,630 km)【天文】木卫一（伽利略所发现的木星卫星之一, 是离木星第五近的卫星, 火山活动剧烈, 因硫化合物呈红色和黄色, 直径3,630公里）。