主要成分

The effective ingredient of cannabis sativa is tetrahydrocannabinol.

大麻一年生草本植物，其有效成分是四氢大麻酚，这是最主要的致幻物质

The hot and spicy taste of cayenne pepper is primarily due to an ingredient known as capsaicin.

该辛辣口味的辣椒主要是由于某一成分称为辣椒素。

The recent development of the extraction and application of capsaicin and hot pepper and red pigment in capsicum was reviewed.

概述了辣椒中主要活性成分辣椒碱、椒红色素的国内外应用现状、取技术及市场开发前景。

Objective: To establish a method for determining the content of primary chemical constituents in the leaves of Cassia angustifolia.

目的：建立番泻叶中主要化学成分的含量测定方法。

Objective: To establish a method for determining the content of primary chemical constituents in the leaves of Cassia angustifolia .

中文摘要：目的：建立番泻叶中主要化学成分的含量测定方法。

Of total copper in the ore, and the main copper sulfide mineral are chalcocite and covellite.

查明了矿石中铜的赋存状态及主要的脉石成分。

Because of the complex chemic component, the quality estimate and control of Chinese traditional medicine is a difficult problem.

由于中药的化学成分极为复杂，它的质量优劣评价方法和相应的质控标准长期以来一直是个难题，这也是影响中药现代化的一个主要因素。

It introduces its main chemical compositions and the development process, with focuses on the characteristics and applications.

介绍了玄武岩纤维的主要化学成分及其发展过程，阐述玄武岩纤维的特性和应用领域。

Result showed that the 24 cultivars could be classified into 5 groups. The first group included 14 cultivars: Rosa "Belami"s"、Rosa "First White"、Rosa "Jubilation"、Rosa "Shuo"、Rosa "Cara Mia"、Rosa "Minor"、Rosa "Sonia Meilland"、Rosa "Grandy Masterpiece"、Rosa "Charles Mallerin"、Rosa "Cherry Brandy"、Rosa "Hiogi"、Rosa "Acrobatics"、Rosa "Lady Meillandina" and Rosa "Kardinal". The second group included 4 cultivars: Rosa "Xanadu"、Rosa "Flower Fair"、Rosa "Reading Desk"、and Rosa "West". The third group included 2 cultivars: Rosa "Red hat" and Rosa "Sohloss Manhieim". The forth group included 2 cultivars: Rosa "Purple Time" and Rosa "Sunny Girl". The fifth group included 2 cultivars: Rosa "Kent" and Rosa "Red Meidiland.

然后以主成分分析和R型聚类分析以后筛选出的主要性状为指标进行了Q型聚类分析，结果显示，24个品种可以分为五大类型：第一类型包括第一白、红衣主教、贝拉米、卡拉米亚、朱王、索尼亚、大杰作、黑王、黑旋风、樱桃白兰地、米衣、米兰夫人、绯扇、杂技表演14个品种；第二类型包括花仙、西方大地、读书台和华夏4个品种；第三类型包括曼海姆和红帽子2个品种；第四类型包括紫色时代和太阳姑娘2个品种；第五类型包括肯特和红梅郎2个品种。

The chicon quality after forcing was low and the yield, size, weight and density of chicon was small. In this paper, the changes of main chemical composition of chicory root during vernalization and storage at different temperature, the storage quality of chicory root at different temperature and the factors of affecting forcing were studied.

本试验以北京市农林科学院蔬菜研究中心提供的菊苣为试材，分别研究了菊苣根中主要化学成分在春化期间和不同贮藏温度下的变化情况，不同低温条件下菊苣根的贮藏品质以及影响菊苣软化的一些因素等进行了探讨，以期为今后菊苣根的贮藏和软化技术研究提供一些参考。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。