In one case, a group of conservationists has already taken it upon itself to try on their own to save an endangered tree, the Florida Torreya tree, through Assisted Migration.

在一个案例中，一群自然资源保护主义者已经自己采取行动，通过协助迁徙的方式来拯救一种濒临灭绝的树——佛罗里达香榧树。

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The frame of this lounge chair folds upon itself into seven different seating positions including the arm chair shown above and the chaise lounge and bench chair below.

这个躺椅框架折叠成七种不同的座位位置，包括扶手椅和躺椅和长椅。

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In autoimmune diseases, like arthritis or Crohns disease, t cells mistake fragments of the body's own cells for foreign invaders, leading to the body launching an attack upon itself.

在自身免疫系统疾病中，如关节炎或克隆恩氏病，T细胞误把自身细胞碎片当作外来入侵者，导致自己攻击自己。

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He said the expulsion is obviously a matter of concern to the United States and a step backward,and that North Korea has only brought upon itself further isolation.

VOA: standard.2009.04.15

He's a literary power, a figure who could be called upon to supply the voice of tradition in itself.

他是一种文化力量，一个,可以随时用来声援传统文化的人物。

耶鲁公开课 - 弥尔顿课程节选

He also shows, however, that normal politics is, itself, dependent upon extraordinary politics, periods of crisis, anarchy, instability, revolution, where the normal rules of the game are suspended.

然而他也同时了解到常态政治，本身有赖于破例政治，诸如危机，失序，不稳定，革命等时期，当游戏的常态规范,遭搁置。

耶鲁公开课 - 政治哲学导论课程节选

The kingdom has for years taken it upon itself to hold most of the world's spare production capacity.

FORBES: Magazine Article

Police with rescue dogs were searching the building Friday, which appeared to have buckled and collapsed upon itself.

WSJ: Mumbai Building Collapse Kills at Least 35

The risk here would be political: the Fed would be taking upon itself to intervene in the markets.

ECONOMIST: The Federal Reserve