In the context of English vocabulary, which prefix is commonly used to mean 'within' or 'inside'?
答案解析
The question tests the understanding of word prefixes. The prefix 'intra-' means 'within' or 'inside', which is the correct answer. 'Trans-' means 'across' or 'beyond', 'inter-' means 'between', and 'extra-' means 'outside'.
正确答案：C