These steps , known to microbiologists as Koch's postulates, were established in the 19 th century.这些微生物学家称之为柯赫氏法则的步骤确立于19世纪.Almost all of the techniques that microbiologists use are customized for life as we know i...
指明它的来处纯洁而珍贵.How pure , how dear their dwelling - place.他挡住老人,查问他的来处.He stopped the man and demanded to know where he came from.这般祥和恬逸的思绪传达着如此纯净 、 教人爱怜的来处.Where thoughts serenely sweet express How pure, how dear their dwe...