2、digress v.走向岔道，离题
Two groups are very affected by a more recent phenomenon, but let me digress.

3、purge n.净化，泻药 v.净化，通便
On the military side, more than 40 percent of senior officers have been purged or replaced, as well.

4、probe n.探针，调查 v.调查
It will probe the mysterious magnetic field that exists between the stars.

5、palate n.味觉
The muscles appeared first on the tongue and palate.

6、abreast adv.并列地
I like to keep abreast of what's going on in the world.

7、stripe n.条纹，斑纹
We'll use this picture to do an analysis of the stripe patterns.