We do not know whether we will achieve an agreement, Trump said.

" 虽然我们不知道双方能否达成协议，" 特朗普说。

He said they were focused on achieving an agreement that stood the test of time and despite progress, some difficult issues still remained.

他说他们的重点是达成能经得起时间考验的协议，尽管取得了进展，但仍存在很多难题。