That is the necessary precondition for the stability that I think everyone is seeking for the country to be able to move forward,"

VOA: standard.2009.05.25

It would appear that Milton's suggesting that it's chastity that actually establishes something like a precondition for hearing and learning that inspired song that's actually sung before the throne of God in Revelation.

那表明了弥尔顿的建议,关于确实是贞操建立了某些事物,像听和学的事先准备对歌的启发作用,在《启示录》里确实在上帝面前唱了。

耶鲁公开课 - 弥尔顿课程节选

But Israel says the Palestinians imposed an unacceptable precondition namely,a complete freeze on settlement expansion.

VOA: standard.2009.08.21

The Palestinians say direct talks will not happen until Israel stops building in the occupied West Bank and in East Jerusalem, a precondition they had not placed in prior rounds of negotiations.

VOA: standard.2010.05.03

"There has never been a precondition,"

VOA: standard.2009.11.01