Here's a breakdown:

* Large Covalently-Bonded Molecule: This means the molecule is formed by strong covalent bonds between its atoms, creating a large structure.

* Repeated Structural Unit: This refers to a specific group of atoms (called a monomer) that is repeated many times to form the longer chain.

Examples of polymers:

* Polyethylene: Made up of repeating ethylene units (CH2-CH2)

* Nylon: Made up of repeating amide units

* Proteins: Made up of repeating amino acid units

* DNA: Made up of repeating nucleotide units

Let me know if you'd like more information on any of these examples!