单词：acute angle handpiece
单词：acute angle handpiece 相关文章
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. If you get a scratch, your skin can heal itself. But if your car gets scratched, it stays scratched. Scientists at the University of Southern Mississip
Scientific American(三)月
shrimp crab 不管是英文还是中文，人们往往用动物的名称来形容人，例如骂人的时候说某人像猪，像狗，或者赞扬某人鹤立鸡群等。美国人有时把人形容为像
美国习惯用语
Unique Species of Shrimp, Anemones Thrive Near Caribbean Seafloor Vents The volcanic vents were discovered five kilometers down near the bottom of Cayman Trough - an undersea trench south of the Cayman Islands. Expedition co-leader Jon Copley, a mari
VOA标准英语2012年(一月)
Tobacco Farmers Harvest Shrimp Its harvest time in Tennessee, but the Corbin family matriarch isnt gearing up to harvest the typical corn, cotton, or soybeans. Jane Corbin and her sons are draining a pond to gather the fresh water shrimp, or prawns,
VOA标准英语2011年(十一月)
U.S. authorities have expanded fishing restrictions in the Gulf of Mexico because of fears of contamination from the BP oil leak. The spill poses a threat to the safety of seafood from the Gulf, and the future of the fishing industry in Louisiana and
VOA标准英语2010年(六)月
Every spring, the Mississippi River dumps tens of thousands of tons of nutrient runoff into the Gulf of Mexico. Add temperature, current and wind to that pollution, and you have the Western Hemisphere's largest stretch of oxygen-poor watersa so-calle
2017年Scientific American(二)月