定义：

一种用于测量未知光学玻璃样品折射率的光学仪器。这个仪器是恩斯特•阿贝在20世纪初期设计的，该仪器的测量值通常可以精确到小数点后的第四位（测量精度0.0002）。

English Expression：

Abbe refractometer

Definition:

An optical instrument used to measure the index of refraction of an unknown sample of optical glass. Designed by Ernst Abbe in the early 1900s, this instrument will typically yield index accuracy of two units in the fourth decimal place.

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