It does sometimes help to know the nutritional content of foods.知道食物所含的营养成分有时的确有帮助。When you sprout seeds their nutritional content increases.让种子发芽后，其营养含量会提高。A diet lacking in nutritional value will not keep a person heal...
Semiconductor devices can perform a variety of control functions in electronic equipment.半导体器件在电子设备中能起各式各样的控制作用.In semiconductor receivers transistors take the place of vacuum tubes.在半导体收音机中晶体管代替了真空管.The conductor is rel...