~/Tools/linuxnd/lnd login -u 登录账号 -p 登录密码
    ~/Tools/linuxnd/lnd list
    ~/Tools/linuxnd/lnd list oss://[First_1_part_of_数据路径]
    ~/Tools/linuxnd/lnd cp -d oss://  ./                           #-->ERROR
    #The following two commends download the same datasets, only the first one have two tiers of directories H**************2/R*****4
    #NOTE that next time downloading once is enough!
    ~/Tools/linuxnd/lnd cp -d oss://[First_1_part_of_数据路径] .
    #~/Tools/linuxnd/lnd cp -d oss://[First_3_parts_of_数据路径] .

    cd [Target_directory_containing MD5.txt]
    cp MD5.txt md5sum_check.txt
    ~/Scripts/check_md5.sh