美国科学60秒 SSS 2013-02-12
时间：2019-01-20 作者：英语课 分类：Scientific American(二)月
Taste may be the least understood of our five senses, even basic questions like where the taste bugs 1 come from remain mysterious until now. In the study published in the journal Stem Cell, scientists identified the lose of parental 2 cell that gives rise to the daughter cell responsible for taste. Taste bugs are made of lusters 3 of taste cells, which contain the receptors for sweet, salty, sour, bitter, and umami. The are concentrated in the bumpy 4 papillae that covered the tongue surface. But taste bugs are not static *. The resident taste cells live only about too weeks before being replaced by new born baby taste cells. After all the bits * now permanent. But no one knew the address of taste cell nursery. To track it down, scientists scanned the tongue for cell that produced the same marker protein as the body's other stem cells, which give rise to our other specialized 5 cells. The researchers discovered the reservoir of stem cells that lie in the trenches 6 around the papillae at the back of the tongue. This stem cells can produce all of the different taste cell types and so allow us to savor 7 all of life's flavors.
- All programs have bugs and need endless refinement. 所有的程序都有漏洞，都需要不断改进。 来自《简明英汉词典》
- The sacks of rice were swarming with bugs. 一袋袋的米里长满了虫子。 来自《简明英汉词典》
- He encourages parental involvement in the running of school.他鼓励学生家长参与学校的管理。
- Children always revolt against parental disciplines.孩子们总是反抗父母的管束。
- I think we've a bumpy road ahead of us.我觉得我们将要面临一段困难时期。
- The wide paved road degenerated into a narrow bumpy track.铺好的宽阔道路渐渐变窄，成了一条崎岖不平的小径。
- There are many specialized agencies in the United Nations.联合国有许多专门机构。
- These tools are very specialized.这些是专用工具。
- life in the trenches 第一次世界大战期间的战壕生活
- The troops stormed the enemy's trenches and fanned out across the fields. 部队猛攻敌人的战壕，并在田野上呈扇形散开。