This book was originally a work of practice, but I didn't expect to stick to it all the way, and it was also greatly favored by the editor, and I was about to sign A, I hope you brothers and sisters will support it, and those who have money will hold a money field, and those who have no money will borrow money to hold a money field, just kidding. I hope you will recommend it a lot, collect, and support others if you can. Thank you here.