根据英文解释写出相应的英文词汇~急
1、ahighlystructuredhigh-levelprogramminglanguagedevelopedbyNiklausWirthofETH,auniversityinZurich,Switzerland
2、asymbolwhichindicatestheactiontobeperformedonoperands
3、adescription,referenceorexplanationaddedtoorinterspersedamongthestatementsofthesourcelanguage,whichhasnoeffectinthetargetlanguage
不是翻译,而是要英文的答案哦,是和计算机相关的