Runtime out occurs when installing some python packages

A few days ago, there was always a runtime out problem when installing some python packages
(1) Change the source download quick
pip install taichi-nightly -i http://pypi.douban.com/simple --trusted-host pypi.douban.com (Source of taichi's Douban)
(2) Change the limit time
pip --default-timeout=100 install -U Pillow (this is what I tried).
I was afraid that there was not enough time to set 1000. I didn't succeed the first time I tried it. Just try it~