What is your weak point of which we don't know?

English writing always been a weak point in English teaching in college.

英语写作一直是大学英语专业教学中的薄弱环节.

The operator broke the glass free himself but wounded his hand trying to escape.

挖土机的操作人员打破了玻璃逃生时受伤,但他试图逃跑时.

Mechanical excavation is carried out by a variety of machines, including the shovel and drag-line excavator.

机械挖掘采用多种工具, 如铁铲和索铲挖土机.

Analysis of Paulownia Plants with Witches' Broom Tissue Culture Seedling Treated with Rifampicin Using SSR Technique

利福平处理患丛枝病泡桐组培苗的SSR分析

The height growing process of 1-year-old root cutting of Paulownia was simulated with Gompertz and Logistic equations.

以1年生泡桐埋根苗为对象，研究苗木年生长规律。采用Gompertz方程和Logistic方程模拟高生长进程，结果表明；

The changes of endogenous iaa, ctk and nucleic acids during adventitious root formation of Paulownia fortunei in vitro

白花泡桐离体培养生根IAA，CTK及核酸含量研究

Cultivate the mycelial growth of Pleurotus ostreatus and Auricularia polytricha, using the paulownia flower extract instead of potato of the PDA medium. The results showed: the mycelial growth of Pleurotus ostreatus is thinner;

用泡桐花浸液代替PDA培养基中的马铃薯，培养平菇和毛木耳菌丝体，结果表明：平菇菌丝体生长较弱；

The Distribution of Pau-Tong ( Paulownia) Tree in Hupei Province

泡桐属（Paulownia）在湖北省的分布

A study on VA Mycorrhizae formed on the tissue-cultured plantlets of Paulownia

泡桐组培苗VA菌根的研究

Study on the Relationship between the Content of Vitamin C and Resistance of Paulownia spp. to Witches ′ Broom

泡桐丛枝病的抗性与维生素C关系的研究

In this paper some internal and external factors affecting paulownia seedlingCO_2 exchange are studied.

研讨了影响泡桐苗木CO2交换的部分内外因素。

Establishment of Paulownia SSR reaction system

泡桐SSR分子标记反应体系的建立

Eradication of Paulownia Witches' Broom Agent ( MLO) from Infected Plantlet by Meristem Tip Culture

泡桐微茎尖培养脱除泡桐丛枝病原（MLO）的研究

Preservation and multiplication of Paulownia witches' broom pathogen MLOs by host plant tissue culture

泡桐丛枝病病原MLO在寄主离体培养组织中的保存与增殖

Construction of Paulownia genome library and subcloning of the special DNA fragment homologous to actin gene

泡桐基因文库的构建及actin基因同源顺序的亚克隆

Study on the fertilization and the development of fruit and seed of Paulownia

泡桐属（Paulownia）受精作用及子实发育的研究

RFLP analysis of Paulownia Plants

泡桐属植物种类的RFLP分析

Changes in Endogenous Phytohormone and RNA in Paulownia fortunei ( seem.) hemsl. during the development of adventitious root

白花泡桐不定根发生过程中内源激素和RNA的变化

Preliminary study on the pollen morphology of Paulownia

泡桐属（Paulownia）花粉形态学的初步研究

The effects of different photoperiods on in vitro plantlet regenerations from leaves of Paulownia tomentosa, P. fortunei and P.elongata on the optimal MS and 1/ 2 MS media for their in vitro organogenesis respectively were studied.

以毛泡桐、兰考泡桐和白花泡桐叶片为外植体，在其体外器官直接再生的最适MS和1/2MS培养基上，研究了不同光周期对泡桐叶片体外植株再生的影响。