iBT TOEFL Topic Vocabulary Breakthrough Unit 028

iBT TOEFL Topic Vocabulary Breakthrough Unit 028
Author: Li Xiaolai

28. In ancient times mosaics were a form of floor decoration made of small pebbles and later of cut or shaped pieces of marble, hard stone, glass, terra-cotta, mother-of-pearl, and enamels. The shaped pieces, in the form of small cubes, are called tesserae. The tesserae are embedded in plaster, cement, or putty to hold them in place.

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