单词：orbital period
orbital period的用法和样例：
例句
- The orbit period depends on the altitude of the satellite.卫星的轨道周期取决于其高度。
- With Callisto's orbital period of about half a month, the entire sequence could take less than a year.由于木卫四绕木星公转的轨道周期约为半个月，整个过程只需不到一年。
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