每个大成年树木就如同一个巨大的水泵，通过其叶或针的蒸发，将成百万加仑的水回放到大气中去。

Each large mature tree ACTS as a giant water pump, recycling millions of gallons of water back into the atmosphere via evaporation from its leaves or needles.

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两年生欧亚植物，花黄色，其叶芳香，用做祛风剂或调味品；广泛栽培，尤其作绿肥或覆盖作物。

Biennial yellow-flowered Eurasian plant having aromatic leaves used as carminative or flavoring agent; widely cultivated especially as green manure or cover crop.

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但是，一旦古树正常生长发生变化，其叶内的SOD、POD活性值会升高，SOD活性升高尤为明显。

But, if the normal grown condition of tree is changed, the activity value of SOD, POD in leaves will be higher, especially SOD.

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