You've answered your own question. In fact you really want to do conda install ...
instead of using pip if you can.
You can install a conda package also without activating the environment. Just use conda install -n <env_name> <package>
or conda install -p <path/to/env> <package>
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与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…