"We continue to monitor production of Russian mobile missiles to ensure that in their production of the SS-27 mobile , they are not also building,covertly, a missile called the SS-20 which was banned during the Reagan years [So there are a large number of measures which allow the governments to be confident that the other side is in fact carrying out the treaty,"

VOA: standard.2009.04.08

In contrast, on the whole other side, you've got 3 things that are invisible, like the number 3.

相反地，另一方面,有些不可见的东西，例如数字。

耶鲁公开课 - 死亡课程节选

In contrast, on the whole other side, you've got 3 things that are invisible, like the number 3.

相反地，另一方面,有些不可见的东西，例如数字。

耶鲁公开课 - 死亡课程节选