n. the concentration of attention or energy on something
n. maximum clarity or distinctness of an image rendered by an optical system
n. maximum clarity or distinctness of an idea
n. a central point or locus of an infection in an organism
n. 焦点, 焦距
vi. 聚焦, 注视
vt. 使聚焦, 调焦, 集中
[计] 焦点