A high proportion of five-year-olds have teeth in poor condition.
五岁儿童牙齿不健康的比例高。
《牛津词典》
2
Finland provides three years of maternity leave and subsidized day care to parents, and preschool for all five-year-olds.
芬兰为父母提供3年的产假和日托补贴，并为所有5岁儿童提供学前教育。
3
Research shows that given 15 minutes of free play, four- and five-year-olds will spend a third of this time engaged in spatial, mathematical, and architectural activities.