jnd大白算法在线测试简介：It was already getting late, and the sky outside was cast with a chilling air. It was pitch black outside and all the survivors stayed in their rooms timidly, not daring to go out.
It was already getting late, and the sky outside was cast with a chilling air. It was pitch black outside and all the survivors stayed in their rooms timidly, not daring to go out.
