周而复始英语怎么说

Once and again,
One time and again.

　　周而复始[zhōu ér fù shǐ]
　　go round and begin again; come full circle; roll on in cycles; come at last back to the original starting point, and then begin again; go round and round

　　双语例句
　　该循环周而复始，永无止境。
　　This cycle repeats itself ad infinitum_

all the year round