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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低磷逆境下，马尾松针叶的可溶性糖和脯氨酸含量增加，而叶绿素和可溶性蛋白含量降低；

Under the situation of low phosphorus stress, the concentrations of soluble sugar and free proline increased whereas the chlorophyll and soluble protein decreased.

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大多数纸是由针叶树的纸浆制成的。

Most paper is derived from the pulp of coniferous trees.

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