鸟类

Precocial - This term is used to describe species of birds in which hatching occurs relatively late in development.

Precocial -这个词是用来描述种鸟类，其中孵化出现相对较晚，在发展中。

When we conducted a chemical assay of the uropygial preen gland secretions, we found 4 times more volatile octadecanol, nonadecanol, and eicosanol in ratios in males than in females, making them putative male pheromone candidates.

在这篇文章中，研究人员选取全世界最为广泛的笼养鸟和模式实验鸟－虎皮鹦鹉作为实验对象，利用传统的双向选择和GC-MS分析方法，证明鸟类确实存在"性信息素的通讯"。

Female birds also showed overt preferences for the odor of male preen gland secretions or the 3-alkanol blend equivalent preened onto the plumage of a male over that of female counterparts.

另一方面，以往认为尾脂腺在鸟类中主要起到羽毛防水和折射不同波长光的作用，化学研究上也主要集中在对尾脂腺分泌的蜡脂成分的分析上。

They are of the human and prehuman types, neither superfishes nor glorified birds but distinctly mortal.

他们是人类和人类存在以前的类型，既不是超级鱼类也不是荣耀的鸟类，而明显是人类。

Improper chemical control, may be prejudicial to the activities of birds and need special attention.

不当的化学防治，有可能损及鸟类的活动，需要特别注意。

Grand Bay is a prime spot for bird watching during the winter and spring.

大海湾在处于冬天和春天之际最适合观察鸟类。

Psittacosis,especially as contracted by human beings from birds.

饲鸟病鹦鹉热，特别是指人类从鸟类传染而得的一种病

Gregory Paul, in a 1989 article, compared known impacts and super eruptions of the Mesozoic with radiations of the major pterosaur, dinosaur, and bird groups to see if a pattern could be identified.

格雷戈里·保罗在1989年发表的一篇文章里，比较了当时已知的中生代的撞击与火山活动，用发光法测定了翼龙、恐龙和鸟类种群，试图找出一个固定的模式。

The quetzal is a symbol of freedom and the national bird of Guatemala.

头饰是一个象征自由和国家鸟类的危地马拉。

Also farm outer wall and inner wall partial, this is a restventilates, is dry, illumination, rainproof and prevents the fly, themosquito, the birds invasion, moreover is the most main link.

再说农场的外墙和内墙部分，这是一个休息通风、干燥、光照、防雨和阻止苍蝇、蚊子、鸟类入侵的，而且是最主要的环节。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐