[jiāo diǎn]
[数] [物] (二次曲线焦点; 主焦点) focal point; focus
									
										virtual focus
										虚焦点
									
									
									
										principal focus
										主焦点
									
									
									
										defocus
										焦点分散
									
									(问题的关键所在或争论的集中点) central issue; centre; point at issue
									
										the focus of the struggle
										斗争的焦点
									
									
									
										focal points of contradictions
										矛盾的焦点
									
									
									
										the heart of the matter
										问题的焦点
									
									
									
										the points at issue
										争论的焦点
									
									[气] origin
[冶] (焦斑) focal spot