com/dictionary/penetrate
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See example 1 of the intransitive form (and the example sentences) at Merriam Webster's dictionary here:
Hi book mango, I didn't understand the question about fish and example 1 and "through." You can say penetrate through, I imagine. It's like to bore a hole into metal, or bore a hole through a metal post, etc.
book mango 418I think"penetrate" means going into/throu