名詞 crux:

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

1. Therein lies the crux of the matter.
   問題的關(guān)鍵就在那里。
2. Now we come to the crux of the problem.
   現(xiàn)在我們來談問題的癥結(jié)所在。