12．安全系統(tǒng)不會允許你進入大樓，除非你有正確的密碼．（unless）Thesecuritysystemwillnotpermit/allowyoutoenterthebuildingunlessyouhavethecorrectpassword．．

分析 The security system will not permit/allow you to enter the building unless you have the correct password．

解答 The security system will not permit/allow you to enter the building unless you have the correct password．
本句描述的是安全系統(tǒng)所具備的功能，所以主句用一般將來時，從句用一般現(xiàn)在時．
這是一個unless引導(dǎo)的條件狀語從句，permit/allow you to do sth允許某人做某事．

點評 對于句子的翻譯要能夠充分體現(xiàn)原句的意思，恰當(dāng)使用相關(guān)短語，注意使用所給詞，方能符合條件的翻譯準(zhǔn)確．

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