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。

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Listing 1 below contains basic conditional code that could achieve this goal.

下面的清单1包含实现这一目标的基本条件代码。

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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