The polynucleotide chain is helical.多核苷酸键是螺旋形的.In a globular protein, certain portions of the chain are coiled into helical segments.在球状蛋白中, 链的某些部分被盘成螺旋状.Two types of viral symmetry have been recognized, the cubical symm...
The eagle is the animal most sacred to the Native Americans.对印第安人来说，鹰是最神圣的动物。Feathers of various kinds are used by Native Americans for ceremonial purposes.美洲印第安人在举行仪式时用到各种羽毛。The Americans are the sons , not the bastards...
请于今日将随函附上的捐款表格用所提供的邮资预付的信封寄回。Return the enclosed Donation Form today in the prepaid envelope provided.美元汇率今日收盘时有所上涨。The American dollar finished the day up against foreign currencies.今日在蒙特利尔的街头巷尾，人们的意见仍摇摆不定。Today on the ...