名詞 focal point:

1. a point of convergence of light (or other radiation) or a point from which it diverges
   同義詞：focus, focal point
2. a central point or locus of an infection in an organism
   同義詞：focus, focal point, nidus
3. the concentration of attention or energy on something
   同義詞：focus, focusing, focussing, focal point, direction, centering