Despite being classified as a depressant, alcohol initially acts as a stimulant on the central nervous system.虽说被划定为镇静剂，酒精最初却是被当作中枢神经系统的兴奋剂。Rocks can be classified according to their mode of origin...可以根据岩石的成因对其进行分类。The ...
他是古家俱鉴定家.He is a connoisseur of antique furniture.利奥把自己看成是一名疯狂症的鉴定家.Leo held himself to be a critic of craziness.幽默的鉴定家非常之少, 而且他们都不一致.There are very few good judges of humor, and they do not agree....