在1970年末，随着高分辨率无线电干涉仪的出现，部分答案清楚了。

With the advent of high-resolution radio interferometers during the late 1970's, part of the answer became clear.

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文章概述了国内外双频激光干涉仪产品的现状，介绍了近年来双频激光干涉仪向高分辨率、高精度、高测速等几个方向的发展趋势。

The present state of the dual-frequency laser interferometer in the world is introduced in brief. The trends of development to high resolution, high accuracy, high measurement speed etc. are given.

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