关键

In order to solve the problem of low efficiency and short service life of hot pressed diamond bit when drilling in hard and compact formation, relations between diamond exposure of hot pressed bit and rock abrasiveness were analyzed in this paper. Research on matrix performances of hot-pressed diamond bit was firstly carried out.

针对在硬而致密岩石中钻进时效低的难题，本文分析了碳化钨基热压钻头的金刚石出刃与岩石研磨性等岩性之间的内在联系，认为钻头的胎体成分及其性能是关键，硬而带脆性的胎体性能有利于全刚石出刃，从而能提高钻进速度。

Gibberellin and abscisic acid are two kinds of very important AAAplant hormones, the interaction between them is a key factor in the regulation of metabolism and development.

脱落酸和赤霉素是两种重要的植物激素，脱落酸和赤霉素之间的相互关系是调节多种生理活动的关键因素。

This thesis proposes to make some comparison of the New Historicism by putting it on the axes of ordinate and abscissa of the western literary theory. Then we can verify the position of New Historicism in research objects, research methods and the practices of literary criticism, and obtain the comprehension and sublimation of its significance and value to the construction of Chinese literary theory.

本文旨在运用历史和逻辑相结合的方法，将新历史主义放在西方文论发展的坐标轴上进行纵横比较的研究，通过"比较"，力求在文学的研究对象、研究方法、批评实践等若干关键问题上给新历史主义找准定位，达到对其理论的理解和升华，从而能够阐发出新历史主义对中国文论建设的意义和价值。

The fruit abscission mechanism of plant is generally considered as one of the key factors maintaining system stability.

植物果实的脱落机制普遍被认为是维持系统稳定的关键因素之一。

In the second chapter, we investigate propagations of desynchronous disturbances in synchronized chaotic one-way coupled map lattices. It is well known that spatiotemporally chaotic systems with large gradient couplings may show convective instability under the absolute stability condition of chaos synchronization. This convective instability is the key reason for the effective propagation of control signals.

时空混沌在不同的耦合系数情况下会表现出不同的动力学行为，用驱动实现具有强梯度耦合系数的时空混沌同步时，会观察到在绝对稳定条件下被驱动系统表现出对流不稳定性，这种对流不稳定性是在单个信号驱动下实现混沌同步的关键原因。

Second,there is not the absoluteness about everything.getting the good education may not be better than teaching themselves.the point of studying restes with ourselves.

第二，凡事没有绝对的。接受高等教育不见得比自己学习的会更好哦。学习主要的关键都在于自己的啊。

This is one of the key stuff I''ve be absorbing.

这也是我领悟到的关键之一。

A theoretical method to calculate the absorption coefficient of the multi-layer absorber is proposed in this dissertation.

本论文基于主动吸声降噪的特点，围绕其若干关键技术问题，在理论和计算等方面进行了研究与探讨。

Key Words :air chamber,graded index lens,absorption peak, coupling.

关键 词：气室，渐变折射率透镜，吸收峰，耦合

Most of the molecular characteristic absorption is very weak, and the absorption line width is very narrow that can't be measured by traditional methods.

TDLAS系统的关键是利用激光二极管有很高光谱分辨率和可调谐性的特点，可以对特定分子在特定光谱范围内的一条振转线的光谱吸收进行测量而反演吸收气体的浓度，而且能够把待测分子与背景的干扰区分开来。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。