Jìhuà cái dìng, qíngkuàng bù xuán zhǒng yòu biàn le.
No sooner was the plan set than the situation changed again.
Tips
usage
Two senses: time (before you can turn around = in a flash) and courage (not turning one's heel = not retreating). Context usually makes it clear. Mostly literary; in speech 一转眼 or 立刻 is more common.
