Herbs，Shrubs，and Trees．These terms are frequently employed in reference to plants． Some distiaction may be made here as to these COIDIIIOn terms of classitication。
A herb iS a plant whose stem does not develop much woody tissue and，therefore， remains soft and succulent． The plant usually dies，at least down to the soil，after flowering． Herbs may be either annual，biennial，or perennial。
A shrub is a woody perennial plant，usually smaller in height than a tree，in which several aerial stems of nearly the same size arise from the root system．
A tree is a woody perennial plant with a single main stem or trunk which attainS a considerable height above the soil before it branches。In trees there are two types of branching，excurrent and deliquescent． When the trunk extends vertically upward to the top of the tree，as in pines，the branching is said to be excurrent；when the main stem does not continue to the top but divides into several more or less equal branches，as in oak．it iS said to be deliquescent。
Aerial stems on the basis of structure may be divided into two types，herbaceous and woody． Herbaceous stems are greed and are relatively soft in texture；are readily broken，have little woody tissue；and for the most part，have a life span of one season of growth。 Woody stems，especially when they are older，are harder，thicker in surface appearance，and larger in diamater than herbaceous stems．Most stems of this type are perennial and are composed largely of wood．
The Taiwan government strongly pushes the eco-technology in recent years,use the natural building materials，such as native stone，soil and applicative plant，to avoid to break the local ecosystem environment．However，partial engineering structures still need the concert usage of other natural or the artificial materials。to reach the target of looking after both sides of the engineering security and biodiversities．The preservation work of soil and water has a long history in Taiwan．The traditional way is to apply the solid construction to protect the environment，such as concrete materials．The effect of theses constructions on the ecological environment was neglected in the past．Recently，maintain and recovery of natural environment has been emphasized． The eco-teChnology then be received the attention by public．Many construction cases had executed. The applied materials of eco-technology are diverse． The selection of these materials for the Construction of eco-technology need to be studied．In this study，the evaluation models of applied materials for eco-technology were proposed．The quantitative score were obtained by expert’s person evaluation．The statistical procedures were adopted to compare the performance of applied materials for eco-technology。
全部回复（3 ）
只看楼主 我来说两句-
tony8310
沙发
能不能发给我一个英汉词典！谢谢！email：tony8310@163.com
2005-11-30 22:37:30
赞同0
-
xwb001115
板凳
The Taiwan government strongly pushes the eco-technology in recent years,use the natural building materials，such as native stone，soil and applicative plant，to avoid to break the local ecosystem environment．However，partial engineering structures still need the concert usage of other natural or the artificial materials。to reach the target of looking after both sides of the engineering security and biodiversities．The preservation work of soil and water has a long history in Taiwan．The traditional way is to apply the solid construction to protect the environment，such as concrete materials．The effect of theses constructions on the ecological environment was neglected in the past．Recently，maintain and recovery of natural environment has been emphasized． The eco-teChnology then be received the attention by public．Many construction cases had executed. The applied materials of eco-technology are diverse． The selection of these materials for the Construction of eco-technology need to be studied．In this study，the evaluation models of applied materials for eco-technology were proposed．The quantitative score were obtained by expert’s person evaluation．The statistical procedures were adopted to compare the performance of applied materials for eco-technology。
2005-11-10 11:46:10
赞同0
加载更多回复 举报
回复 举报