load the necessary library dynamically for plugin, when the plugin is running

i would like to do following things:
can i load the necessary library dynamically for the plugin, when the plugin is running.
The necessary library for my plugin is very large.
If i pack the necessary library with the plugin together, the file size of plugin will be very large.
And the class of necessary library is saved under a directory and always changed.
So i would like to load the necessary library dynamically for plugin, when the plugin is running.
Any informations will be appreciated.
Yiping Chen

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