You should be careful in the sun.
在阳光下你要当心。
A How are you feeling now?
A 你现在感觉怎么样？
B Much better, thanks. It’s good to go out.
B 好多了，谢谢。出去走走一定很好。
A Good. But you should put something on your head. Have you got a hat, or some sun screen?
A 好。但是你头上应该戴些东西。你有帽子或者防晒霜吗？
B Why?
B 干嘛？
A It's very hot and sunny today. You should be careful in the sun. You might get sunburnt.
A 今天非常热，阳光强。在阳光下要当心。你可能会被晒伤的。
B You worry too much! I'll be OK.
B 你担心得太多了。我会没事的。

Notes注释
1 Many people don't realise how careful / careful you have to be in hot sun. You can try to persuade them -! You should be careful in the sun. / You should be careful in the sun.
很多人没有意识到在炎热的阳光下应该careful /当心。你可以这样劝说他们You should be careful in the sun. /在阳光下你要当心。
2 You can give advice about wearing a hat / a hat or using sun screen / sun screen: You should put something on your head. / You should put something on your head. / Have you got a hat? / Have you got a hat? / Or some sun screen? / Or some sun screen?
你可以提出戴帽子/ a hat或者用防晒霜/ sun screen: You should put something on your head. /你头上应该戴些东西。Have you got a hat? /你有帽子吗？Or some sun screen? /或者有防晒霜吗？

Key phrases and sentences
How are you feeling now?
Much better, thanks.
Good. But you should put something on your head.
Have you got a hat, or some sun screen?Why?
It's very hot and sunny today.
You should be careful in the sun.
You might get sunburnt.
You worry too much! I'll be OK.

你现在感觉怎么样？
好多了，谢谢。出去走走一定很好。
好。但是你头上应该戴些东西。你有帽子或者防晒霜吗？
干嘛？今天非常热，阳光强。
在阳光下你要当心。
你可能会被晒伤的。
你担心得太多了。我会没事的。