慢速英语:3D打印帮你一天内建造家园

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mortar – n. a mixture of substances used between bricks or stones to keep them together

on-site – adj. place where an activity happens

cheap – adj. costing less than other things

magnitude – n. the size or importance of something

3D – adj. something having height, width and depth

print – v. to make a copy or reproduce something

festival – n. a special time; a series of performances

advanced – adj. involving high technology or modern

quarter – adj. divided in four equal parts; one-forth