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主焦点 zhǔjiāodiǎn
agric. prime focus (focus primus)
met. principal focus; principle focus
space prime focus
tech. meridional focus; primary focus; tangential focus
焦点
chem. principal focal point
主〔牛顿〕焦点
earth.sc. prime focus
主焦 点
: 6 phrases in 2 subjects
General2
Technology4