ten days
Ten years is the traditional Chinese time unit. Ten days for a ten days, three for the month. The concept of ten days from the beginning of the summer has existed, there are ten words in the Oracle. In ancient China, the use of heavenly days to determine the "month" time unit in the cycle of the moon, repeated every ten days, so specifically with a "ten" word to express the concept. Now the Chinese still use ten days to express ten days of this time period. The first ten days of the month for the first time, the second ten days for the middle, the remaining days for the late. Ten days also used to refer to the age of people, ten years old for a long time. The extension of the use of ten years, including eight years old man on behalf of eighty years old and so on. After the Zhou Dynasty also some royal part of the descendants to change to surname. ...