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The first line of defense mechanical is the front doors of the school.
The first line of defense chemical is the chemical spray the office keeps in case of intruders.
I have to use the acids to protect my students from the intruders.
The hallways lead to the second line of defense, the doors to the classroom.
The second layer of defense is the doors to the classroom. They provide an extra layer of protection for the students.
The third line of defense is the chemistry teacher. She has acids that only attack intruders.
The acids used do not harm the students but only the intruders, which is what they are specified for.
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