there's many a slip twixt cup and lip idiom UK saying (US there's many a slip between the cup and the lip)
杯到嘴边还会失手;世事往往功亏一篑
said to emphasize that many bad things might happen before something is finished
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。