Learner's definition of BASIS
1
: something (such as an idea or set of ideas) from which another thing develops or can develop基础；要素；基点 [count]
—
usually singular通常用单数 -
This principle forms the basis [=base, foundation] of the country's economic policies and will provide a firm basis for future development.这条原则是制定国家经济政策的基本依据，同时也将为国家未来的发展打下坚实的基础。
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The actor's letters form the basis of the biography. [=the biography is based on the actor's letters; the most important information in the biography comes from the actor's letters]这个演员的传记取材自他的信件。
[noncount]
2
[noncount] : a reason for doing something根据；原因 -
The judge ruled that there is no legal basis [=ground] for a new trial.法官裁决认为没有进行新一轮审判的法律依据。
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The latest news at least provides some basis for hope. [=some reason to hope]最新的消息至少给了我们有所期盼的理由。
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On what basis were the students chosen/selected? [=how were the students chosen/selected?; what was considered when the students were chosen/selected?]选拔出这些学生的依据是什么？
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Students were chosen/selected on the basis of [=according to] their grades and test scores.选拔出这些学生的依据是他们的成绩和测验分数。
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Our decisions are made on the basis of the available information. [=we base our decisions on the available information]我们是根据手头上的信息做出的判断。
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The company does not hire employees on the basis of their race, sex, age, or religion.种族、性别、年龄或者宗教信仰不是公司招收员工的依据。
3 [singular]
a : a fixed pattern or system for doing something固定模式；固定体系 —
used with on与on连用 -
He visits his grandmother on a regular basis. [=regularly]他定期看望祖母。
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The company changes its Web site on a daily/weekly basis. [=every day/week]这家公司每天/每周更改网页。
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changes that occur on an hourly basis每个小时都发生的变化
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They hired her on a trial/temporary basis.他们是以试用/临时工的方式雇佣她的。
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People are seated on a first-come, first-served basis. [=the people who arrive first are given seats first]人们就座的方式是先到先坐。
b —
used to describe the way people act with each other交流方式；互动方式 — see also on a first-name basis at first name