Each person should switch roles frequently.

每个人都应该经常切换角色。

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The pregnant pause may have given her impetus to switch to more serious roles—something to watch for in 2009.

怀孕短暂的休息也许会给她更大的动力来争取一些主要的角色，2009年我们再看了。

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If the driver gets stuck or frustrated or loses his train of thought, the navigator and driver can switch roles.

如果驾驶员停滞不前或受到挫折或者失去了思路，导航员和驾驶员可以互换角色。

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Medvedev would switch roles, he said, and likely become the Prime Minister if Putin wins.

FORBES: Protesters Powerful, But Putin Even More So

The agreement to switch roles was made four years ago, when Medvedev was just getting his feet wet in Red Square.

FORBES: Putin Pres Run Official; Likely To Be Russia's Next President

Going forward, this trendline could switch roles to act as resistance.

FORBES: by Elizabeth Harrow