ultra-, 超过的，极其的，violet, 紫色的。

1. The container is invisible until you shine an ultraviolet light on it.

那个柜子只有用紫外线照射才可以看见。

2. It's called ultraviolet rays.

它被叫做紫外线.

3. The ozone layer surrounding the earth protects our skin from being hurt by the ultraviolet rays.

环绕地球的臭氧层保护着我们的皮肤免受紫外线的伤害.

4. Ozone is best known for its role in screening the Earth from harmful ultraviolet rays from the Sun.

臭氧最广为人知的作用是保护地球免受太阳紫外线的伤害。

5. The sun's ultraviolet rays are responsible for both tanning and burning.

阳光中的紫外线是皮肤晒黑和灼伤的根源。