She refused to hand over the ear keys to her husband until he had promised to wear his safety belt.
【正确答案】等丈夫同意系上安全带，她才把汽车钥匙交给他。
【答案解析】①理解和翻译难点：一、识别“not...until”句型并掌握其翻译技巧；二、理解短语动词“hand over”的含义。②翻译方法：调整语序，变原文否定句为汉语肯定句。