为什么Special Effects会简写成FX?

为什么Special Effects会简写成FX? There were excellent special effects. its special effects are exciting to watch 可用被动吗 watch和special effects之间不知被动关系吗 Merry Christmas 为什么简写成 X‘mas? Received signal level 为什么简写成RX 信使RNA为什么简写成mRNA?转运RNA为什么简写成tRNA? something special还是special something?为什么? they are 可以简写成they're,那么these are为什么不能简写成these're 为什么写英文名字有时候是名字简写成字母 有时是姓简写成字母 同义句改写 Though excited to watch the special effects,I don't th Exciting as its special effects are___,there is too much vio