重点

School of Bioscience and Bioengineering, Key Lab of Fermentation and Enzyme Engineering of Guangdong,Guangzhou 510006, China

华南理工大学生物科学与工程学院，广东省发酵与酶工程重点实验室，广东广州510006

Department of Epidemiology and Biostatistics,School of Public Health,Peking University Health Science CenterBeijing 100083,China

北京大学医学部公共卫生学院流行病与卫生统计学系/流行病学教育部重点实验室，北京 100083； 2。

This paper deals with the advance in the study of terrestrial Permian-Triassic boundary. At first, some index TPTB sections and their research backgrounds are introduced. Then, the research status on the synthesis of the TPTB, including biostratigraphy, eventostratigraphy, isotopic dating, magnetostratigraphy and sequence stratigraphy etc., is analyzed. Finally, the existing problems and the next research directions about the TPTB study are assessed.

着重介绍了几个目前陆相二叠系－三叠系界线研究的重点剖面及其生物地层学研究进展；分析了陆相二叠系－三叠系界线综合地层学研究现状，包括生物地层学、事件地层学、同位素年代学、磁性地层学和层序地层学等；剖析了陆相二叠系－三叠系界线地层学研究中存在的问题及进一步的研究方向。

The progress of recent research on the lignin biosynthesis is introduced in this paper.

本文介绍了木质素生物合成途径，重点综述了调控木质素合成的手段及限速酶研究方面的最新进展，并提出存在的问题及展望。

Key Laboratory of Biotic Environment and Ecological safety in Anhui Province; b.

生物环境与生态安全安徽省高校省级重点实验室；b。

College of Life Sciences, Anhui Normal University; Provincial Key Laboratory of Biotic Environment and Ecological Safety

安徽师范大学生命科学学院，安徽省高校生物环境与生态安全省级重点实验室

In the early days of his new administration, Mr. Obama's emphasis was on bipartisanship, reaching out to Republicans in hopes of a broad approach on the economy.

在他的新政府成立初期，奥巴马先生的重点是两党合作，拓展在经济上的广泛的方法希望共和党人。

Two main aspects of the research work are as follows:(1) The paper introduces the experimental ice forces on semi-circular breakwaters which is made by State Key Laboratory of Coastal and Offshore Engineering of Dalian University of Technology and calculate the ice value for different radius semi-circular component, based on which it speculates on that horizontal ice value and water level accord with biquadratic polynomial function, meanwhile, the paper analyses incidence of ice heap to horizontal ice value of semi-circular component.

论文的主要工作有三部分：(1)主要介绍大连理工大学海岸和近海工程国家重点实验室所做的物理模拟试验，应用水平冰力计算公式计算了不同半径半圆型构件的冰力值；根据这些数值的分析，推测半圆型构件水平冰力与水位符合四次多项式函数关系；同时分析了碎冰堆对半圆型构件水平冰力影响。

This can be regarded as yet are the focus of events bis.

这可以被看作是没有的重点活动之二。

Especially, the water-filling method with the integer bit constraint is researched and a modified greedy method and a bisection bit allocation method are proposed, respectively.

重点研究了在实际系统中整数比特约束下的注水法则，提出了一种改进的贪婪算法和对分比特分配算法。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失