for

2064 篇文章
Broad leaves must be shed in winter for their damage by frost.
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Broad leaves must be shed in winter for their damage by frost. 由于严寒的原因 阔叶树得在冬天落叶

Summers here are long enough for broadleaf trees to replace conifers.
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Summers here are long enough for broadleaf trees to replace conifers. 由于有足够长的夏季 阔叶林得以取代针叶林

for a few miles from the coast the ice is already splitting.
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for a few miles from the coast the ice is already splitting. 离岸几英里远的海面上 冰层已经开始崩裂

Now the mother can start hunting for the seals they must have,
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Now the mother can start hunting for the seals they must have, 现在母熊将猎杀海豹 获取紧需的食物

At last it seems that they're ready for their journey
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At last it seems that they're ready for their journey 最后 它们似乎做好了旅行的准备

That is where she hunts for the seal she needs to feed her cubs.
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That is where she hunts for the seal she needs to feed her cubs. 而母熊则需要在那里捕杀海豹 喂养幼熊

For now though it's still minus thirty degrees
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For now though it's still minus thirty degrees 而现在的气温仍然有-30℃

but also a problem for the mother.
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but also a problem for the mother. 但对母熊而言却是一个问题

Their mother has not eaten for five months
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Their mother has not eaten for five months 它们的母亲已有5个月没有进食了

Now she converts the last of her fat reserves into milk for her cubs.
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Now she converts the last of her fat reserves into milk for her cubs. 现在它将仅剩的一点脂肪 变成乳汁喂养它的宝贝们