one swallow doesn't make a summer idiom saying
独燕不成夏（指一件好事的发生并不意味着整体情况会好转）
used to say that because one good thing has happened, it is not therefore certain that a situation is going to improve
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。