[caption id="attachment_3922" align="aligncenter" width="533"] Chinese idiom ru yu de shui[/caption]
How is everyone's summer so far? I hope you are having a relaxing time.
如鱼得水（rú yú dé shuǐ） means "like a fish in water." This idiom is used to describe someone who is very satisfied and in his/her element. The idiom is also used to describe someone who seems to have a natural talent and/or enjoys using that talent doing something.
This is how you can use the idiom:
He took to university life like a fish in water and quickly made new friends.
I hope everyone is speaking Chinese 如鱼得水.