After six weeks, the researchers infected all the young turkeys with listeria.六周之后, 研究人员让所有的幼鸡都感染李斯特菌属.Cooking food completely destroys listeria.而将食物煮熟则能够完全消灭李氏杆菌.Obiective To establish a fast and accurate method to exam...
这一小段由一位大有前途的青年男高音倾情演绎。This small part was taken with elan by a promising young tenor.唱歌的四个声部是女高音 、 女低音 、 男高音和男低音.The four parts in singing are soprano, alto, tenor and bass.这位男高音歌手师承一位歌唱家.The tenor was a pupil of a singe...