cruxes

名词 crux:

1. a small conspicuous constellation in the southern hemisphere in the Milky Way near Centaurus
   同义词：Southern Cross, Crux, Crux Australis
2. the most important point
   同义词：crux, crux of the matter

1. Therein lies the crux of the matter.
   问题的关键就在那里。
2. Now we come to the crux of the problem.
   现在我们来谈问题的症结所在。