1、12歲的英語:12 years old,英 [jɪəz əʊld] 美 [jɪrz oʊld]。
2、兒童通常在11或12歲時升讀中學。Children usually transfer to secondary school at 11 or 12。
3、那個12歲的男孩失蹤三天了,警方對他的安全感到擔憂。The police are concerned for the safety of the 12-year-old boy who has been missing for three days。