o-level

基本解释

I didn't do biology O-level , so I have not even the smallest grasp of the nutritional properties of plants and seeds, let alone animals.
我没学过营养学，也没修过高中生物学课程，因此一点儿都不了解植物和种子的营养特性，更不用说动物了。
He's not even very good with theoretical physics. After a brief conversation about centres of gravity, he admits that he failed his O-level in the subject.
他甚至并不擅长理论物理。简单地谈了重力中心问题之后，他承认，自己的这门课没有达到O级。
These guys are intelligent, self-made, tenacious, and here is me with my one O-level .
这些家伙聪明伶俐、自力更生、意志顽强，而我只有一个高中文凭。

For the first time the W.H.O.raised its alert level from phase four to phase five on April twenty-ninth.

formerly, in Britain the basic level of the General Certificate of Education, now replaced by GCSE
formerly, in Britain (as modifier)