These are some of it behind, which is security. <br>1: You can only follow your understanding first, if you understand a lot according to the picture, it is difficult to explain.
These are followed by some of it, which is security.<br>1: You can only press your understanding first, if according to the understanding of the diagram a lot is not easy to explain.
There's some of it behind these. This is security.<br>1: Only according to your understanding, if according to the understanding of the diagram, many are not easy to explain.<br>