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single tree 單駕橫木 =whiffle tree.

single-acting

This paper expounds the development and variation of the forestry science , forest and forestry neally in past two cen turies the forestry science in itself goes through a transformation from traditional forestry science to modern forestry s cience . the modern forestry science , with the object of studying the establishment , manageme nt and exploitation of the forestry ecosystem and the core of developing the eco logical environinent functi on of the forestry ecosystem , is a subject that takes an overall play to the mul tiple benefits and function of forest . the cognition of forest also undergoes a variation from a single tree to trees g roup and still to forest ecosystem due to the deep alteration of the understand ing of forestry science and forest , people begin changing their understanding of forestry from a central for m of timber utilizing which formed for a long time to a form that takes developi ng the ecological environment function of forestry ecosystem as its core and fo cal point , and takes an overall play to the ecological , economical and social function of forestry as its leadi ng thought and aim , so as to realize the sustainable development of forestry 論述了林學、森林與林業近兩個多世紀以來的發展和變化.林學經歷了由傳統林學向現代林學的轉變.現代林學是以森林生態系統的營建、經營管理和利用為研究對象,以發揮森林生態系統的生態環境功能為核心,全面發揮森林的多種效益和多種功能為目的的學科.對森林的認識也經歷了由單株樹木到樹木群體到森林生態系統的變化.由于對林學及森林認識的深刻變化,人們對林業的認識也就從長期形成的以木材利用為中心,轉變到以發揮森林生態系統的生態環境作用為核心和重點,全面發揮森林的生態、經濟和社會功能作為林業的指導思想和目標,以實現林業的可持續發展

With the four forest community ' s age nearly the same , the order of different forest ground biomass of single tree was quercus liaotungensis > betulaplatyp hylla > popular davidiana > pinus tabulaeformis 該研究揭示了森林群落自然演替的規律,對森林群落的經營管理和在黃土高原丘陵溝壑區進行林草植被建設和生態環境重建具有特殊意義。

How i looked forward to catch the first view of the well - known woods ! with what feelings i welcomed single trees i knew , and familiar glimpses of meadow and hill between them 我多么希望一眼就看到熟悉的林子呵,我是帶著怎樣的感情來歡迎我所熟悉的一棵棵樹木,以及樹與樹之間的草地和小山呵!

It seems that god s offer is easier . hes created the whole garden of eden solely for the two of them , except for one single tree . however , they took even that 好像上帝的東西比較簡單, ?造全部伊甸園給他們兩個享受,只有一棵樹要求他們不吃而已,結果他們也把它吃了!

“ oh , “ said jeremy , and he ran out to play . while outside , he searched for the tallest tree . he looked everywhere but couldn ' t find a single tree “哦, ”杰瑞米說,就跑出去玩了。在外面他就尋找最高的樹,他把所有的地方都看過了就是不能找到一棵最高的樹。

Random amplified polymorphic dna ( rapd ) markers were used to construct molecular genetic linkage map of a single tree ( p . taiwanensis hayata . ) 采用rapd分子標記來構建黃山松單株樹(仙居磐黃)的分子遺傳連鎖圖譜。

A single tree will absorb one ton of carbon dioxide over its lifetime 一棵樹在它的有生之年能吸收一噸的二氧化碳。

A single tree will absorb one ton of carbon dioxide over its lifetime 一棵樹在它的一生中可吸收1噸二氧化碳。

As a result , they turned green again , and not a single tree died 結果是:茶樹又綠了!一棵也沒死!

A single tree in a field is prominent 田野里孤零零的一棵樹是很突出的。

Not a single tree relieved the flatness of the plain . 平原上單調得毫無變化,連一棵樹都沒有。