beenworkingontheroboticflyprojectforoveradecade.Afewyearsago,histeamgotthegoaheadtostartpiecingtogetherthecomponents.“Theaddeddifficultywithaprojectlikethisisthat actuallynoneofthosecomponentsareofftheshelfandsowehavetodevelopthemallonourown,” hesaid. Theyengineeredaseriesofsystemstostartanddrivetheroboticfly....
Reproductive isolation(RI)is the core of biological species concept(BSC)[1].In other words,there are many forms of RI among species that hinder genetic exchange to ensure genetic purity,so that species maintain their own biological characteristics.At the initial stage of speciation,the introgression...
To the casual observer, the wobblers do seem to contradict Gause's hypothesis since they all live in the same place and eat the same types of insects. But if you observe these birds more closely, the wobbler species are not really competing with one another for the exact same food at th...
And there are other advantages I mean, if you’re an all-female population you don’t have to waste time searching and competing for mates, there are no more sexually-transmitted diseases and so it seems like the easiest decision – a...
(5)Which proverb can best describe the method of farmers' planting new species? BA.Every coin has two sides.B.Kill two birds with one stone.C.Birds of a feather flock together.D.There is no garden without weeds. 答案(1)A.细节理解题。根据第一段中的There are lot...
例如,学生在阅读一篇关于动物保护的文章时,频繁遇到 “endangered species(濒危物种)”“habitat(栖息地)” 等生词,通过上下文的理解以及多次出现的强化,便能轻松掌握这些词汇的含义与用法,远比孤立地背诵单词效果要好得多。 另一方面,阅读理解为学生打开了一扇了解世界的窗户。从科技前沿的发明创造到历史长河中的传奇...
But look more closely. Can you see the small ones, too? Insects(昆虫)make up 80 percent of all the world’s living kinds. Look on the ground. Imagine you could look under the ground, too. Many small living things with one cell live there. Life is everywhere around us, in every ...
Embarrassment and happiness don't work together;they are the opposites of each other. Unfortunately,we can't choose our emotions,but we can choose how we live and how we think of others.Thinking back on embarrassing m...
strong enough that it could be used to predict whether two people were already friends or not. The relationship probably goes two ways. We are drawn to people who think like us. We then influence their thoughts over time, whi...
More organizations (组织) have joined together to educate the local people that trading elephants is against the law. Elephant poaching has dropped to a very low level. The local people have learned to live peacefully with the elephants, one of the wildlife treasures in the world.1. MEP was...