标签：larvae 相关文章
Norway is one of the top ten aquaculture producers, and the industry goes to great length to secure feed for farmed fish. 挪威是十大水产养殖国之一，而其水产养殖业也是竭尽全力确保鱼食供给。 It has even sent factory shi
VOA标准英语2018年(十一月)
34 Raising Oysters In the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting them. First, farmers selected the oyster bed, cleared the bottom of old shells and other debris, then scattered clean shells about.
新概念优美背诵短文50篇
VOICE ONE: This is SCIENCE IN THE NEWS in VOA Special English. I'm Shirley Griffith. VOICE TWO: And I'm Steve Ember. Today, we tell about diseases spread by mosquitoes -- the most widely hated insects in the world. (MUSIC) VOICE ONE: A female mosqui
VOA慢速英语2009年（五）月
No matter how seldom you've opened that calculus textbook on your shelf, the chances of worms having eaten it are pretty low. But books written back in the Renaissance have had much better odds of becoming worm food. Now we know that the holes left b
Scientific American(十一)月
No matter how seldom you've opened that calculus textbook on your shelf, the chances of worms having eaten it are pretty low. But books written back in the Renaissance have had much better odds of becoming worm food. Now we know that the holes left b
Scientific American(十一)月
No matter how seldom you've opened that calculus textbook on your shelf, the chances of worms having eaten it are pretty low. But books written back in the Renaissance have had much better odds of becoming worm food. Now we know that the holes left b
Scientific American(十一)月
After spending a year or so as larvae under water, they transform into winged adults and take to the skies. The millions of tiny flies attract far bigger animals. As they hold a mass mating orgy along the banks of the lake, brown bears come to feed o
自然百科2011年
Almost magically, they form a temporary nest of their own bodies. The larvae and food are taken into the nursery at its centre. Tomorrow they will do the whole thing again, marching for two to three weeks to reach fresh hunting grounds, where they ca
自然百科2011年
In the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting them. First, farmers selected the oyster bed, cleared the bottom of old shells and other debris, then scattered clean shells about. Next, they planted f
考研背诵50篇
Fish raised in the more acidic seawater that would result from higher carbon dioxide levels forget to flee predators. More carbon dioxide emissions lead to more CO2 dissolving in the oceans, which turns the water acidic. Those sour seas slow the grow
60秒科学
How do baby coral find a new home in the open ocean? They listen very closelyfor reef sounds. Scientists at the University of Bristol in England had already discovered in the last few years that baby fish who live among coral use sound to find the re
60秒科学
Since the food crisis of a few years ago, much attention has been paid to improving agriculture and conserving the land. But land is not the only source of food. The oceans provide food and jobs for millions of people, yet very little is being done t
VOA标准英语2010年(十)月
This is the VOA Special English Development Report. Guinea worm disease usually does not kill, but it is extremely painful. It prevents people from caring for their farms, their homes and sometimes even themselves. Guinea worms can grow up to one me
VOA慢速英语2008年（九）月
According to a study published this week in Science, genetically-engineered cotton planted near conventional crops may help protect the regular plants from bugs. The researchers say the finding could potentially protect a range of crops over million
VOA标准英语2008年（九月）
Deforestation is one of the big culprits in climate change. And now a new study from the Amazon links deforestation with an increase in malaria. Despite eradication efforts, malaria remains a significant health problem in Brazil. There are around a h
VOA标准英语2010年(六)月
Scientists Sequence Smallest Genome Ever With Antarctic Fly 科学家从南极苍蝇测定最小基因序列 Scientists have just sequenced the genome of a fly native to Antarctica, the coldest, driest and windiest place on the planet, a finding that
VOA标准英语2014年(八月)
Voice 1 Welcome to Spotlight. Im Liz Waid. Voice 2 And Im Joshua Leo. Spotlight uses a special English method of broadcasting. It is easier for people to understand - no matter where in the world they live. Voice 1 Hyacinth Igelle is a farmer. He liv
环球英语 Spotlight
Adult ants communicate with pheromones, touch and even sound. Now researchers have discovered that developing ants called pupae have their own distinctive calls, which identify their social status within the colony. This finding is in the journal Cur
Scientific American(二)月
By Caroline Sawyer Nairobi 09 August 2007 In Kenya, environmental researchers say they may have discovered a new, effective weapon to combat malaria. The disease kills more than 1 million people worldwide each year. Caroline Sawyer reports from our o
2007年VOA标准英语（八月）
Animal Coloration Can Serve Double Duty Nature may be red in tooth and claw. But one plucky caterpillar dresses in orange and black to avoid becoming somebodys lunch. Whats really surprising, though, is that this distinctive set of stripes can serve
2018年科学美国人3月