实验结果表明，在野外环境条件下，光解对于吸附到云杉针叶表面的PCDD／F和PAH的归宿起着重要的作用。

Thus in the field conditions, photodegradation plays a major role on the fate of PCDD/F and PAH adsorbed on spruce needle surfaces.

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拖到绘图页后，可以添加针叶树，如松树、杉树、云杉、红木或雪松。

Drag onto the page to add a conifer tree such as pine, fir, spruce, redwood, or cedar.

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拖到绘图页后，可以添加针叶树，如松树、杉树、云杉、红木或柏树。

Drag onto the page to add a conifer tree, such as pine, fir, spruce, redwood, or cypress.

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