1. spar with sb. 与某人争论/较量
With the primary season forgotten, Mr Obama is now sauntering towards the centre, ready to spar with John McCain.
党内初选经过去，奥巴马现在正式走上总统竞选的舞台，准备和约翰·麦凯恩一争高下7y0UjCzk4r%&lCcvH-!。

2. an indictment of ……的迹象
The poverty in our cities is a damning indictment of modern society.
我们的城市中贫民的苦况就是现代社会的一大败象on&=_]O7srmHArrp0(sR。

3. riven by 被……破坏
This country is often riven by earthquakes.
该国经常受到地震的破坏#h-e^AqO=*C4r。

4. knack for ……的诀窍
Well, it takes a little practice but eventually you will get the knack for doing the right thing at the right time.
嗯，需要一些练习，但最终你是能掌握如何在适当的时机做适当的事情的诀窍的x%&niG#Lw_。