During spring and summer, the surface of Mars is covered by strong storms.

在春季和夏季，火星表面被强风暴覆盖。

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After leaving the earth last summer, Zhu Rong circled Mars for several months and landed on it in May.

去年夏天离开地球后，祝融号围绕火星飞行了几个月，并于今年5月登陆火星。

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Last week, the evidence for life on Mars received another boost, when scientists at Nasa reported enormous plumes of methane emanating from the planet's north during the summer months.

上周，又有发现一个火星上存在生命的证据。夏季的几个月里，NASA科学家发现了大量源自火星北部的甲烷气。

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That looks a fair summary of the state of the flotilla of spacecraft that sailed boldly forth from Earth last summer to study Mars.

ECONOMIST: The current crop of Mars missions has got off to a bad start

The base will actually be built inside a real crater and the daytime temperature of -23 degrees Celsius is like a nice summer's day on Mars.

BBC: Destination Mars on Earth

In the summer of 2000, the Mars Society, a group of scientists, engineers and astronauts, will open its Mars Arctic research station in the Canadian high Arctic.

BBC: Destination Mars on Earth