The transition from forest to treeless tundra on a mountain slope is often a dramatic one.

从森林到山坡上没有树木的苔原的过渡通常会十分突然和明显。

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The changes are manifested in belts from forest, bush, meadow and steppe to desert.

森林、灌丛、草甸、草原到荒漠呈带状更迭。

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It is situated in the center of Asia and it has some climatic zones: from forest-tundra to steppe.

他位于亚洲的中部，它也有很多种的气候区域：西伯利亚大草原的森林苔原。

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The Forest Service is protecting the area from too much human activity so it will return to its natural wild condition.

VOA: special.2009.07.20

So the program was designed to set up students from our, from Wake Forest community

所以，这个项目召集来自维克森林社区的学生，

帮助多文化的家庭 - SpeakingMax英语口语达人

For years,fires from lightening and logger's campfires burned through the areas where the forest had been cut down.

VOA: special.2009.07.20

Natural aerosols are produced by sea salt, desert dust, volcanic eruptions and smoke from forest fires.

ECONOMIST: Climatology: Grey-sky thinking | The

We explored a bathroom tower for a park and a proposed Boy Scout center made from forest thinnings.

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She will deal with security and policing, as well as national emergencies ranging from forest fires to epidemics.

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