The phrases that actually reveal the meaning of "detrimental" as used in Paragraph 7 are:

• [slow] the educational and mental development.
• deprive them of some of the benefits.

What is detrimental?

Detrimental refers to something that is being harmful and creates a negative impact on something. Detrimental has a negative connotation.

We can see that the above phrases actually reveal the meaning of detrimental.

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