In Alabama and Mississippi nearly half of them score "below basic" on maths, which means that even simple calculations baffle them.

阿拉巴马州和密西西比州有差不多一半的孩子没有达到数学考试的及格线，这意味简单的加减乘除也会令他们够呛。

youdao

There are four basic alternatives; they are described briefly below.

有4种基本选择,简略描述如下。

《柯林斯英汉双解大词典》

Below is a basic list of colors and their meanings.

下面列出颜色和它们的基本含义清单。

youdao

The average scores were categorized at each grade level into four groups: below basic, basic, proficient, and advanced.

CNN: Report card shows U.S. students need to improve math skills

More than twice as many American Indian and native Alaskan adults scored below basic levels on literacy than white Americans.

UNESCO: Twenty percent of young New Yorkers out of school and out of work | United Nations Educational, Scientific and Cultural Organization

Just as an example, 78 percent of eighth graders in Los Angeles public schools have a "below basic" understanding of science.

NPR: Seeking Solutions for the Nation's Broken Schools