输入要查询的单词:
standard ruler
查词链接:
https://www.zzcmix.top/dict/standard_ruler
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查看英英释义
abstract:
A standard ruler is an astronomical object whose approximate size is known. By measuring its apparent angular diameter in the sky, one can determine its distance from Earth.
网络释义
标准尺
... 标准齿轮 master gear 标准尺 standard ruler 标准尺寸 module ...
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