Us-china diplomatic relations were "ping-pong diplomacy" open the door.

中美交际关系也被“乒乓交际”敲开了大门。

youdao

"It is a lesson to many countries to open up and have far more cultural exchange and make that a priority for diplomacy.

VOA: special.2010.06.21

I may be open to a sanctions bill in the future but at this moment we need to give diplomacy a chance."

VOA: standard.2009.10.28

"I thought these cables were a prime example of the need for a more open diplomacy, " said Pfc Manning, who addressed the court in uniform.

BBC: Bradley Manning pleads guilty to some Wikileaks charges

"The door remains open to diplomacy should Iran choose to walk through it, " Mr. Obama said.

WSJ: Obama Presses for Mideast Peace in U.N. Address

But certainly, now that the U.S. has accepted Iran's offer for open-ended diplomacy with the Security Council's five permanent members (and also Germany), there is no reason why Mahmoud Ahmadinejad should not be on the guestlist.

CENTERFORSECURITYPOLICY: Obama's big UN adventure