pip的-t标志是什么?

Thi*_*ser 0 python pip

建议使用pip install module-name -t /path/to/project-dir,但是我不知道该t标志的用途。有人能帮我吗?

pla*_*aes 5

手册

-t, --target <dir>
     Install packages into <dir>.
     By default this will not replace existing files/folders in <dir>.
     Use --upgrade to replace existing packages in <dir> with new versions.
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