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focal point kínaiul

AngolKínai
focal point ((optics) a focus; a point at which rays of light or other radiation converge)
noun
[UK: ˈfəʊk.l̩ pɔɪnt]
[US: ˈfoʊk.l̩ ˈpɔɪnt]

重点 /zhòngdiǎn/noun