happen to coincide ⇒ 大家不约而同地投了赞成票。 Dàjiā bù yuē ér tóng de tóule zànchéng piào. → Everybody happened to vote in favour.
不翼而飞
disappear without trace
不胫而走
spread like wildfire
不谋而合
happen to coincide
华而不实
showy
听而不闻
turn a deaf ear
锲而不舍
persevering
可望而不可即
unattainable ⇒ 登上月球,对古人来说是可望而不可即的幻想。 Dēngshàng yuèqiú, duì gǔrén lái shuō shì kě wàng ér bù kě jí de huànxiǎng. → Previous generations would never have believed that man could go to the moon.