[千载难逢 / 千載難逢, qiān zǎi nán féng, ㄑㄧㄢ ㄗㄞˇ ㄋㄢˊ ㄈㄥˊ]lit. hard to meet in a thousand years (成语 saw); extremely rare opportunity; once in a blue moon#32163[Add to Longdo]
[进退两难 / 進退兩難, jìn tuì liǎng nán, ㄐㄧㄣˋ ㄊㄨㄟˋ ㄌㄧㄤˇ ㄋㄢˊ]no room to advance or to retreat (成语 saw); without any way out of a dilemma; trapped; in an impossible situation#35464[Add to Longdo]