做某事最好的时机就是想到它的时候，当下就是最佳时机，灵感乍现之时正是吉日良辰

1. the best time for doing something is as soon as you've thought of it, there's no time like the present, it's an auspicious day (for doing it) when you've just had the idea

expressions (phrases, clauses, etc.) proverb