(also ordinary level) noun [C,U] an exam in a particular subject, at a lower level than A level, usually taken at the age of 16. In 1988, it was replaced in England and Wales by the GCSE, but it is still taken in some other countries. （普通中学教育证书）初级证书考试
oak/əʊk ||; ok/noun1 (also oak tree) [C] a type of large tree with hard wood that is common in many northern parts of the world 橡树
The fruit of the oak is an acorn. 橡树的果实叫acorn。 2 [U] the wood from the oak tree 橡木: a solid oak table 用实心橡木制成的桌子