它们的缺失使寒冷、干燥的火星经历了从未经历过形成湖泊和海洋所需的延长温和期的景象。

Their absence supports the picture of a cold, dry Mars that never experienced the extended mild period required to form lakes and oceans.

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但是，一些人从未发展成严重的躁狂，而是处在较温和的轻躁期。这种形式，我们称为双相ii型。

Some people, however, never develop severe mania but instead experience milder episodes of hypomania that alternate with depression; this form of the illness is called bipolar II disorder.

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在1990年到1991年期间以及2001年相对温和的衰退之后，雇佣情况更加疲软，当时的失业率分别高达7.8%和6.3%。

Hiring was weaker in the aftermath of the relatively mild downturns of 1990-91 and 2001, when the unemployment rate topped out at 7.8% and 6.3% respectively.

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