This cycle has three main phases.

这循环有三个主要的阶段。

No other satellite has flown so close to the gas giant during the main phase of its mission.

此前人造卫星从未在任务主要阶段如此接近过这个气体巨星。

The study was broken into two main phases, and started with 320 men in heterosexual relationships.

该研究分为两个主要阶段，从 320 名处于异性恋关系中的男性开始。