I don't even know the ABC of the subject yet.

我还没入门呢.

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The ABC of engineering is very difficult.

工程学入门很难.

《简明英汉词典》

The literature aspect deals only the ABC of English literature.

在文学方面只涉及英美文学的一些基本常识.

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I am afraid I do not know the abc of thing here.

恐怕我对这儿的情况一点都不了解.

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I don't know the ABC of computers.

我对电脑一窍不通.

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It is surprising that he should examine me in the ABC of English.

他竟拿这最简单的英语知识来考我,实在令人惊讶.

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Such glaring mistakes show that you don't know even the ABC of English grammer.

这些错误太明显了,说明你连最起码的英语语法知识都不懂.

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