imaginary straight line 中文意思是什麼
imaginary straight line
解釋
假想下線-
First, identify the constellation where the radiant lies. watch carefully the path of the meteors. if necessary, you can trace back the path as an imaginary straight line to see whether it intersects with the radiant
首先在星空中找出輻射點所在位置的星座,留心那些流星在天空的軌道,看其延長線是否落在這個輻射點的天區上。
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