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单词
radian
释义
radian
/ray"dee euhn/
,
n. Math.
the measure of a central angle subtending an arc equal in length to the radius: equal to 57.2958°.
Abbr.:
rad
[
1875-80; RADI(US) + -AN
]
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更新时间:2026/6/27 23:40:15