加拿大的寒带森林是油砂的成因。
Canada's boreal forest is home to the oil sands.
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这种植物生长在寒带地区还是热带地区？
Does this plant grow in cold countries or in hot countries?
只有少量水蒸汽能够成功穿过这个寒带。
A little water manages to get past this cold trap.
寒带地区的人寿命较长。
People in cold areas live longer.
为什么会出现这种情况？仅仅是因为热带比寒带更热？
Why? Is it only because tropic zone has a higher temperature?
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