安装Firebase Pod时出现错误-iOS

Question

我正在尝试在我的iOS项目中安装Firebase Pod。我遇到一些错误。日志在这里

    Downloading dependencies
    Installing Firebase (5.16.0)

    [!] Error installing Firebase
    [!] /usr/bin/curl -f -L -o 
    /var/folders/bl/89jc67vs0ddf42399gg3qw7m0000gn/T/d20190429-2472-1rfyfep/file.tgz 
    https://dl.google.com/dl/cpdc/03ecacf4037a7faa/Firebase-5.16.0.tar.gz --create-dirs --netrc-optional --retry 2

    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                             Dload  Upload   Total   Spent    Left  Speed
     0     0    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
    curl: (35) LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to dl.google.com:443 '