It seems we can manual install ‘lungmask’ with follows codes:
import pip
pip.main(['install', 'lungmask'])
or
slicer.util.pip_install("lungmask")
And I find what matters finally! My CT file is too big, about 356MB, it run out my laptop’s memory! So when I turn to use sample datas, everything is OK!
Thank you very much, rbumm! I can enjoy the world cup now!
My computer will be upgraded or CT datas should be smaller!