现在（大家）想象一棵布满了密密麻麻的小针叶的松树。

Now imagine a pine tree with all those little densely packed needles.

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在森林中，潮湿的树木与针叶会使讯号变弱。

In a forest, wet wood and needles attenuate the signals.

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在森林中，潮湿的树木与针叶会使讯号变弱。

In a forest, wet wood and needles attenuate the signals.

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