N the age at which a child should be able to perform a standardized test successfully 成绩年龄; 儿童应该顺利通过标准测试的年龄 [psychol] → compare mental age
He made his first notable achievement at the age of 18.
他在18岁时取得了他的第一个显著成就。
And when they consulted additional national databases, they found that physical fitness at the age of 18 also foreshadowed greater academic achievement later in life.
之后这些科学家又查询了全国范围内的数据库，又发现在18岁时保持身材匀称、健康的人大都会在未来人生中取得更高的学术成就。
About 10% of school-age children have persistent and significant difficulties with math, while many more fail to reach basic levels of mathematics achievement.
约10%的学龄儿童有着持续明显的数学学习困难，其中很多人数学成绩不及格。
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