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Only in the last ten kilometers, I felt slightly pushing my feet, took off my shoes to move my socks, and the feeling of trying again did not decrease. This kind of situation has also occurred in cross-country drivers before. There are no more than two reasons. One is that the shoes are not suitable or the shoelaces are slightly loose. The other is that the socks do not fit. The third is that the feet slide forward when going downhill. Of course, either of the above situations occurs when the slope is downhill. I asked my friends, and two of them had the same situation as me. Judging from experience, it should not be the cause of shoes and socks, it is purely caused by downhill, and it may be that one's shoelaces are not fixed to one's feet.此时此刻，沛公刘邦正走在前往如厕的路上，见到情势有变，不由的惊了一跳。起身又对弟妹们道：哥哥不在家，你们要懂事些，要是淘气，看我回来咋收拾你们。(There is a problem with the head lighting, the left hand is deformed, the body is not aligned with the background edge, and the evaluation is poor.)郑氏来到红椒屋里。Ethernet also has preamble and inter-frame gap when transmitting. The preamble takes up 8 bytes (byte), or 64 bits. The first 7 bytes of the preamble are separated by 10101010, 1 and 0. However, the eighth byte becomes 10101011. When the host detects two consecutive 1s, it will know that there is data at the beginning. During network transmission, the data structure is as follows: