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The exact cause of vulval cancer is unknown, but doctors think it is linked to the human papilloma virus.

确切原因外阴癌症是未知，但医生认为这是联系在一起的人类乳头状瘤病毒

Although its bases are in themselves relatively unknown and unconscious, the ego is a conscious factor par excellence.

虽然它们的基础在它们自身中是相对的未知和无意识，但自我却是一个最卓越的意识因素。

The viscosity solutions for partial differential equations of parabolic type havethree different basic definitions.The three definitions are equivalent when the equa-tions are continuous.But for the discontinuous equations,the equivalence of themare still unknown.

因为抛物型方程粘性解有三种基本定义法，它们在方程为连续时相互等价，对于不连续情况，它们间关系尚不明确，因而在本章里，我们特别证明了其中二个定义：定义1，定义2之间的关系。

Some particular parametric curve s are usually seen in engineering survey,whose types are known but whose parameters are unknown.

测量中经常遇到一些特殊参数曲线，已知它的类型，但需要了解它的参数。

In comparison with the FEM mesh idealization, the parametric surface representation is comprised of more accurate approximation and less unknown variables for the tire contour.

与有限元法的离散相比，参数曲面的描述能够更好的逼近轮胎复杂的轮廓曲面并且有较少的未知变量数目。

We must also take into account that his intimacy with the Greeks developed in him, though unknown to himself, a one-sidedness, which at first sight appears pardonable.

我们也必须顾及，他的亲密与希腊人发达国家在他身上，虽然未知的自己，一个片面性，这乍看起来似乎

There are already many unwanted dogs of unknown parentage.

已经有许多弃犬不明的父母子女关系。

The cause of primary parkinsonism, or Parkinson disease, is unknown.

帕金森氏症的原因不清楚。

Paul Pierce, darting around the parquet floor with ease, scored 28 points, Boston's defense mobbed Kobe Bryant long enough and unknown Leon Powe scored 21 points as the Celtics held off a remarkable Los Angeles rally for a 108-102 win over the Lakers on Sunday night. The Celtics have a 2-0 lead in these trip-down-memory-lane NBA finals.

在周天晚上的比赛中，保罗-皮尔斯，似乎已经融入了周围的木地板，得到了28分，波斯顿的防守在很长一段时间很好的限制了科比-布莱恩特，不知道名的小将拉简-隆多也得到了21分，最终以108-102战胜了湖人队，在总决赛中以2-0领先。

Because the molecular mechanism of parturition is still unknown, there is no perfect method to detect, prevent and therapy preterm delivery.

由于分娩的确切机制在分子生物学水平上还不十分明了，临床上至今对孕妇早产没有理想的的检测、预防和治疗方法。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷