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Data mining, known as Knowledge Discovery in Databases, is defined as the nontrivial extraction of implicit, previously unknown, and potentially useful information from a great volume of data accumulations. It uses machine learning, statistical and visualization techniques to discover and present knowledge in a form being easily comprehensible to humans. Data mining is an advanced data processing technique.

数据挖掘是在数据和数据库急剧膨胀的背景下，为解决"人们被数据淹没，但却饥饿于知识"这种困境而产生的，也是数据库技术、人工智能技术、统计技术、可视化技术等发展的结果，其目的就是从大量的、不完全的、有噪音的、模糊的数据中提取出隐含在其中的潜在有用的可信、新颖并能被人理解的信息和知识，它是一种高级的数据处理过程。

Until last year he was still an unknown singer, but now his name has become a household word.

去年以前他还一直是位默默无闻的歌手，可如今他的名字已家喻户晓了。

In the case that there is no a priori knowledge of the upper bound and lower bound of the unknown parameters, the switching adaptive control design approach is presented.

在非线性系统中未知参数的边界值未知的情况下，提出了切换自适应控制设计方法。

Several years ago a rare species of bird for some unknown reason .

几年前，因为某种无人知晓的原因，这种稀有的鸟绝迹了。

Monogamy (only one sexual partner in a lifetime) seems to be central to a stable marriage; just as infidelity within marriage breaks the belonging, so, too, does infidelity to the future husband before marriage, even if then he is unknown.

一夫一妻似乎是中央的对稳定的婚姻；正无宗教信仰在婚姻之内打破属于同样，如此，做无宗教信仰对未婚夫在婚姻之前，既使他然后是未知的。

Her father was taken aback because this area was unknown to him and to her.

他的爸爸吓了一跳，因为这个地区对他和他的女儿并不熟悉。

The titter that rippled around the room appeared to abash the boy, but in reality that result was caused rather more by his worshipful awe of his unknown idol and the dread pleasure that lay in his high good fortune.

但实际上，他脸红是因为崇拜那位素不相识的女孩，还有幸能和她同桌。他在松木板凳的一头坐下来，那女孩子一仰头，身子往另一头移了移。

Whether aspirin might be more beneficial for fully compliant patients with a low ABI is unknown from this study.

无论阿司匹林可能会更有利于完全兼容的患者低是未知的这项研究ABI读数。

To negate and even tease those so called dignified value, showing his high self-respect and self-esteem even in the danger ; to reveal and abominate the fraud, tricks, developing a sort of unyielding and dismal quality that a hero has at his end ; to neglect and ridicule the high capitalism modern cities and hot primary matters , having a calm and placid attitude to handle with the messy and complicated world ; to hope for and trust the mysterious information and secert in space (something fabled and subconscious ), being curious about the unknown ; to show solicitude for a certain transient psychic phenomena and to expand it, reflecting the open heart and rakish spirit going beyong the mortal world ; to be indifferent to the interest of substance ; to refuse the philistinism and to recall the the past lifestyle in the countryside and so on.

主人公身上，恐怕有这样几点需加以注意：对冠冕堂皇所谓有值存在的否定和戏弄，有一种风雨飘摇中御舟独行的自尊与傲骨；对伪善、狡诈行径的揭露和憎恶，有一种英雄末路的不屈与悲凉；对"高度资本主义化"的现代都市、对重大事件的无视和揶揄，有一种应付纷繁世界的淡定与从容；对大约来自宇宙的神秘信息、默契的希冀和信赖，有一种对未知世界的好奇与梦想；对某种稍纵即逝的心理机微的关注和引申，有一种流转不居的豁达与洒脱；以及对物质利益的淡漠，对世俗、庸众的拒斥，对往日故乡的张望等等。

For a two-dimensional type map, both abscissa and ordinate of the map are two unknown parameters of the linkage. A map is then composed of several regions that represent different types.

於二维类型图中，以连杆组中两个尚待决定的尺寸为图面座标轴，再於图面上区分出代表各种类型的区域。

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％。