英语翻译

if it's sunny outside, you better wear your sunglasses

If the sunshine outsiade is too bright,you'd better wear you sun-glasses

If the sun is very bright outside,you should put on your sun-glasses when you go out.

Put on your sunglasses if it shines sharply outside.

You had better wear your sunglasses when you are out ,if the sunshine is strong.

If the sunlight outside is strong,you should wear your sunglasses when you go out

When the sunlight is dazzling, you should wear your sunglasses.
刺眼的阳光：dazzling、glaring sunlight
太阳镜：sunglasses，shades（口语）
这儿“外面二字”翻译时完全可以省略。当然能非要加上outside也不算错，只是显得有一点点罗嗦。