“自由自在”的英文怎么说？

do sth at wills without any restriction

自由自在

lightheartedness
at ease

例句与用法:
吉姆总是生活在湖边，因而他在水中感到自由自在。
Jim always lived by a lake, and he feels at home in the water.
在自然界, 一切动物都是野生的, 自由自在的.
In nature, all animals are wild and free.

Able to do anything of one's own free will