NPR News:特朗普与普京曾在G20峰会上二次交谈

重点讲解：
1. on the back of 紧跟着；紧接着；
例句：The cuts, if approved, come on the back of a difficult eight years that have seen three London fire stations closed.
8年的艰难时期刚刚过去，在此期间，伦敦有3家消防站遭关闭。如获批准，裁减又会接踵而至。
2. add up 合乎情理；说得通；
例句：Police said they arrested Olivia because her statements did not add up.
警方说他们之所以逮捕奥利维娅是因为她无法自圆其说。
3. have no intention of 不想；不打算；
例句：I have no intention of disclosing their names.
我无意泄露他们的姓名。
4. cast doubt on 使产生怀疑；使不确信；
例句：What he had done cast doubt on his honesty.
他的所作所为使人们对他的诚实产生了怀疑。
5. in attendance 到（某地）；出席（某活动）；
例句：Councillor Paul Tisley will be in attendance at the start of the meeting to welcome us.
议员保罗·提斯里将在会议开始时出席，以欢迎我们。
6. get to the bottom of 找到…的真正起因；查寻到…的根源；
例句：I have to get to the bottom of this mess.
我必须查清造成这一混乱局面的真正原因