知的

In land not known to be an oil field.

不是在所知的油田开采的探险的油井。

Suitable cleaning methods known in the art include rinsing in organic solvent, rinsing with aqueous detergent solution, mechanical abrasion such as sand-blasting, micro-etching with aqueous acids (eg HCl and H 2 SO 4 ) and aqueous oxidative cleaning with, for example, persulphate or perborate.

适当的清洗在艺术已知的方法包括在有机溶剂，与水清洗剂溶液冲洗，机械磨损，如喷砂，微蚀刻与水酸（如盐酸和H 2 SO 4计）和水的氧化清洗，例如，，过硫酸钾或过硼酸盐。

This philos or love is, we know, the primary philatelic virtue, one not easily sustained.

这份坚持的态度、爱，诚如我们所知的，是首要的集邮美德，不是轻易可维持地。

Cuprous oxide is one of the first materials known to display the photoelectric effect , in which light causes electricity to flow in a material.

氧化亚铜是第一个已知的材料显示光电效应，在这种轻的原因电力流动的物质。

The unexpected calamity refers to the calamity that suddenly took place in a situation that people do not have any mental preparation or unable to foresee,such characteristics as it has pilosity different from the general calamity,unexpected,harmfulness,constant.

突发性灾害是指在人们没有任何思想准备或无法预知的情况下突然发生的灾害，它具有不同于一般性灾害的多发性、突然性、危害性、持续性等特点。

There are various failure modes, which could affect a piping system.

目前已知的影响管道系统的有不同的失效方式。

Of the 17,000 species of bees that scientists know about,"honeybees are, for many reasons, the pollinator of choice for most North American crops," a

在科学家所知的17000种蜂类里，国家科学院在去年的一份研究称"由于许多原因，蜜蜂是北美洲大部分农作物最佳的授粉者"。

There are currently 29 known types of collagen differentiated by the sequence of residues in each polypeptide chain.

依据多肽链中的胺基酸序列的不同，可以将目前已知的胶原蛋白分为29种类型。

The electric field is the negative of the potential gradient.

a假如纯量的电位函数是已知的，我们可得到静电场的分布及其各个分量。

We note that the known APN polynomial functions are allquadratic except the APN functions recently found by Edel and Pott. In F22n, theAPN permutation has not yet been found. We construct low di?

我们注意到除了Edel和Pott最近发现的APN函数外，其它已知的APN多项式函数都是二次的，而且在F22n中还没有发现APN置换函数。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。