【Native Speaker每日综合训练—43系列】【43-09】科技 Migration

awillleadaway

生词很多，新人表示看得头晕眼花，结构神马的暂时分不清楚，第一步暂时只能把每段能记住的用简单词汇记下来。
P1
Scienctists study the principle of bird immigration from one feeding place to another, a German science team has learned that birds recognize the destination through a neural path from eyes to brain to feel the magnetic fields.

P2
3’31
Talk about some respectives factors that have negative effects for the migration of birds. Nearly half bird species have the habit of migrating, and enormous variations and environmental changing during their path result obstacles. Besides these factors, global warming and human activities have resulted even more negative effects, deverioting the conditions of stops that are critical for surviving immigration jouney.  What is more, hunting during the path is also a important element to decreasing the numbers. In this case, some species are threatened extictions.
3’32
A number of international treaties and acts were issued to protect the migration of birds. For example, a act in 1918 arose to protect the flyway through U.S., Canada, and Mexico. And another example for international act to protect waterbirds’ stopover habitats through the migration path.
5’32
Discuss how the birds concory征服 the sky, the established theories is that birds are evolved///decended进化from small dinosores恐龙

How this kind of dinasors恐龙 learned flying. Two contrast theories had debated for years. One considered it is a terrestrial species//breed，and the other construed it as a tree-dwelling one who could gliding with its wing and learned to flap in order to stay longer in the air.

A new discovered fossil revealed the secret. It has four wings and two other organs that enable it to do something fly-evolving actions.

Some professors from North California University explained another possibility when these wings and organs functioned.
3’57
A expert presented that this theory above may seem plausible nowadays, but only one problem that this body structure is bad for flapping for long-term was unable to sovlve, so the fly model of the earliest dinosaurs was unkown. He was support by a professor in London University.

However, another expert in bird evolution in a university disagree, claiming that the body structure of gliding has no bearing on that of flapping, this hindlimb and forelimb structure was obviously could not be possible for flapping. And there is no related revolution process connected these two.
5’35
As the ocean temparetures turned higher and higher due to the global warming, some fishes or marine animals may have the ability to change their body chemistries to adopt this environmental change, but most of them the only adoption is moving.

The scientists have learned that smaller organism has less tolerant for the water temperature while the bigger has not, thereby proving the diet that migrating fishes might have to change when they reach a new neighborhood. And what is more, the native fishes of the cooler water may not appreciate of the new comer who will compete food with them. Some data have already shown that after this kind of competition some species may be more prosperous, some may decrease dramatically.

The study of this issue is still underway, and more data are needed to reveal the answer to questions on this topic.

P3  13’27
Some focus on birds’ fly principle that remain secret and their v-fomation. First, it introduces some former methods that is not very efficient, then the second passage mentioned a university team 发明a equipment that is no heavier than 3 pencent of a bird’s wing weight, they anlonize分析 the data received from the equipment set on home-raised ibiris. The reason to choose this specy种类 is because young ibiris need to learn the migration path form its parent. And the data prove some previously believed thought,V-formation is most efficient shape when flying.

Some engineer tried to study the efficiency of bird fly to apply it to robot or new machines. After studying the recording frame-to-frame, He found birds are generally connected with 7 neighbors which is the minimum number needed to be consistent with information surpassed during the whole flock. Then the end seem to need more to be seen.