And they did this very rapidly, and I couldn't understand where they were getting -- they only did the randomness four times -- I couldn't understand where they were getting the other 12 symbols.
他们非常快速的完成这工作， 可我不明白他们究竟做了些什么--- 他们仅仅随意画四行线段--- 我不知道剩下的十二个符号他们是怎样得来的，