focal point
近义词：centre，highlight，focus，direction，focusing，nidus，centering，focussing，
英英释义
Noun
- a point of convergence of light (or other radiation) or a point from which it diverges
- a central point or locus of an infection in an organism;
"the focus of infection"
- the concentration of attention or energy on something;
"the focus of activity shifted to molecular biology" "he had no direction in his life"