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The major factors which hinder the sustainable management of Chinese fir plantation include not only the vulnerable subtropical red soil ecosystem which Chinese fir grow in, but also the unitary community structure and the biological characteristic of this artificial forest community. Additionally, the traditional culture system of Chinese fir including controlled burning lead to the degradation of soil ferti-lity.

影响杉木人工林可持续经营的因素是多方面的，主要和杉木人工林所处亚热带红壤区生态系统的脆弱性和杉木人工林群落的单一性及杉木生物学特性等有关，而传统杉木林培育过程中采取一系列传统的营林措施则加剧了林地地力衰退。

Until these qualities of truth and courage are generated, we will be vulnerable to our own pretenses and fabrications.

在我们生起这些真实和勇气的特质之前，我们仍然容易受害於我们自己的虚伪和造作。

The shallow ditch beside the road provided little cover, leaving them vulnerable to plunging fire from the hills east of the road.

路边的浅沟提供不了什么掩护，使他们几乎无法抵御从路东面小山上射来的犀利火力。

In response to the assaults, Moore shifted Alpha's 2nd Platoon (now under Sergeant George McCulley) to reinforce Charlie's vulnerable positions.

为了击溃敌人的攻击，Moore转移Alpha的第2排(现在由George McCulley军士指挥)去增援Charlie那脆弱的防线。

It's harder to create a goalscoring chance when you play against them , but if you can draw them out of position they become more vulnerable.

在他们面前进球要困难得多，但是如果你诱使他们离开自己的位置，那么他们会变得脆弱得多。

Patients suffer from low levels of plasma clotting factors . They are vulnerable to injuries: once a haemophiliac starts to bleed, there is no way to stop the bleeding except by an injection of the missing clotting factor. Without this timely injection, internal bleeding may cost the patient's life.

因为血液中缺乏凝血因子，患者不仅极易出血，且一旦出血就无法自行止住，内腔器官出血往往会致命，患者只能靠注射凝血因子止血。

Despite the alarm, many AIDS experts are quick to point out that not all heterosexuals are equally vulnerable.

尽管警钟已经敲响，许多艾滋病研究专家很快出来指正：并不是所有的异性交合染病机率会一样，在当今社会任何有性生活的人都有染病的风险，但这一风险对不同的人来说并不一样。

Add this to the fact that women are hormonally more complicated and biologically more vulnerable.

加之这样的事实：女性在荷尔蒙上更加复杂，而生物性上却更加脆弱。

Moreover, while northern Chinese housebuyers like to pay in cash, mortgages are much more common in the south, which makes the market more vulnerable to credit restrictions and slowing growth.

另外，中国北方的购房者喜欢用现金支付，而在南方，按揭购房现象则远为普遍，这使得市场更容易受到贷款限制和经济增长放缓的影响。

And some hydrologists say that by trapping silt the dam could actually make downstream riverbanks more vulnerable to flooding.

和一些水文学家说，通过捕捉淤泥坝实际上可能使下游河岸更容易受到洪水。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。