单词：orbit radius
orbit radius的用法和样例：
例句
- Cordelia and Ophelia orbit inside the synchronous orbit radius.天卫六与天卫七属于同步轨道半径之内。
- The Roche limit for the earth is a small fraction of the radius of the moon's orbit.地球的洛希极限相当于月球轨道半径的一小部分。
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