对于十岁和十岁以下的孩子，读一本书不应超过三到五天，对于大一点的孩子不应超过八到十天。

For children of ten and under, a book should take no longer than three to five days, and no more than eight to ten days for older children.

youdao

报道说，作为好的开端，练习者要每周三次做30到60分钟的运动，以后争取每周做五天。

A good beginning, the report says, is to exercise aerobically for 30 to 60 minutes three times per week, working toward a five-day-per-week goal.

youdao

报道说，作为好的开端，练习者要每周三次做30到60分钟的运动，以后争取每周做五天。

A good beginning, the report says, is to exercise aerobically for 30 to 60 minutes three times per week, working toward a five-day-per-week goal.

youdao