Solar storms aimed at Earth come in three stages, not all of which occur in any given storm.

扑向地球的太阳风暴分三个阶段，但并不是所有的阶段都发生在特定的风暴中。

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We will be creating the model in three stages.

我们将分三个阶段创建模型。

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It is mainly improved in three stages: before, during and after.

主要是从三个阶段对其进行完善，分别是事前、事中和事后。

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Each of those topics - from adding and subtracting to fractions and decimals - is approached in three different stages.

VOA: standard.2010.08.10

Because human psychology is slow to change, a broad economic move usually occurs in three stages.

FORBES: Deleveraging Bites On Both Sides Of The Atlantic

They announced the first results of the country's complex parliamentary poll, which takes place in three stages and over three months.

BBC: Egypt election officials announce 62% turnout

Reversals in pay cuts for Southampton City Council workers would be phased in three stages over the next 20 months if staff agree to them.

BBC: Southampton council pay cuts reversal deal unveiled