novelty

The novelty of the 3D printer quickly wore off after the students printed their first models.

(Chinese) 在学生们打印出第一个模型后，3D打印机的新奇感很快就消失了。

Electric cars were once a novelty, but now they are common on most city streets.

(Chinese) 电动汽车曾是一件新鲜事，但现在它们在大多数城市街道上都很常见。