求翻译：2011年7月20日，姚明宣布正式退役。主要原因是左脚多次骨折，这就告诉我们在生活中，要坚持锻炼和休息相结合，以保持良好的身体状况，你才能更有效地学习。是什么意思？

July 20, 2011, Yao Ming announced the official retirement. Mainly due to multiple fractures left foot, which tells us that in life, we must adhere to the combination of exercise and rest, in order to maintain good physical condition, you can learn more effectively.

July 20, 2011, Yao Ming officially retired. main reason is that his left foot fractures on many occasions, tells us in life, we must insist on combining exercise and rest in order to maintain good physical condition, you can learn more effectively.

On July 20, 2011, Yao Ming announced retires officially.The primary cause is the left leg many times bone fracture, this tells us in the life, must persist exercises and rests unifies, maintains the good bodily condition, you can study effectively.

On July 20, 2011, Yao formally retired. Mainly due to the fracture of the left foot several times, which tells us in life, you want to combine exercise and rest, to maintain good physical condition, you can learn more effectively.

On July 20, 2011, Yao formally retired. Mainly due to the fracture of the left foot several times, which tells us in life, you want to combine exercise and rest, to maintain good physical condition, you can learn more effectively.