Most people have flown a kite or have seen one ride and dip(下降）in strong spring wind. Not so many people know that kites were first made in China thousands of years ago. The ancient Chinese were making and flying kites even before they were writing.

    A long time ago, the Chinese made kites to use in wars. They would fly these war kites in the dark. The kites were fixed(固定）so that they made strange sounds. Men at war would hear these sounds and run away. They thought those strange sounds were made by gods in the sky.

    The ancient Chinese also flew kites to bring good luck and to make their crops grow rich and tall. Sometimes they tied long strings(细绳）and hooks(钩) to their kites. Then they would fly the kites over water, letting the hooks hang down to catch fish.

    The Chinese use sticks(树枝), strings and paper for their kites. Some of these kites look like animals or trees. Others look like birds or houses.

已知复数z=x+yi$\left(x,y\in R\right)$  且 |z-2|=1 则 x,y 满足的轨迹方程是____.