Chinese ⇄ English Russian

主焦点 zhǔjiāodiǎn
agric.	prime focus (focus primus)
met.	principal focus; principle focus
space	prime focus
tech.	meridional focus; primary focus; tangential focus
主〔牛顿〕焦点
earth.sc.	prime focus

主 焦点: 6 phrases in 2 subjects

General	2
Technology	4