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单词 focal
释义 focal
adj. of, at, or in terms of a focus.
Phrases and idioms
focal distance (or length) the distance between the centre of a mirror or lens and its focus. focal plane the plane through the focus perpendicular to the axis of a mirror or lens. focal point = FOCUS n. 1.
Etymology: mod.L focalis (as FOCUS)
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更新时间:2025/3/10 12:24:05