1. A 4 value TTL gate circuit is used to design 4 value RS flip flop , D flip flop and JK flip flop. 采用自己研究出来的四值TTL门电路，设计出了四值RS触发器、D触发器和JK触发器。
2. The output of one flip-flop is the input to the next; the state changes consequently "ripple through" the flip-flops, requiring a time proportional to the length of the counter. 一个触发器的输出是下一个的输入，因而状态的变化以波动形式通过各个触发器，所需时间与计数器的长度成正比。
3. The output of one flip-flop is the input to the next; the state changes consequently "ripple through" the flip-flops, requiring a time proportional to the length of the counter. 一个触发器的输出是下一个的输入，因而状态的变化以波动形式通过各个触发器，所需时间与计数器的长度成正比。
4. Upper lid entropion involves the eyelashes rubbing on the eye, but the lower lid usually has no eyelashes, so hair rubs on the eye. 上眼睑内翻导致睫毛摩擦眼球，而下眼睑通常没有睫毛，因此下眼睑内翻引起毛发摩擦眼球。
5. Furthermore, The protective lid features bipolar knife switch which resolves safety issues when the lid is open. 此外，当盖子是打开的时候，给予保护的盖子内有两极的闸刀来解决电流的安全流通。
