为什么cell+phone前面不加定冠词the,例如Cell phones have altered the relat

为什么cell+phone前面不加定冠词the,例如Cell phones have altered the relat Cell Phones the advantages and disadvantages of cell phone Forty percent of kids 8 to 18 in the U.S.have cell phones... 1.The price of cell phones _____ recently . 英语翻译Cell PhonesAs is shown in the chart,cell phones are beco This cell phone is ___, if ___ the cell phone I had stolen l It might have been on the bus_I lost my cell phone. would you please p( ) me the cell phone?填空 英语作文advantages and disadvantages of the cell phone Press the TAB to answer your cell phone the impact of cell phone on my life