The ALMA and GLT improved the resolution and sensitivity of the observations and helped realize the imaging of the ring around the M87 black hole at a wavelength of 3.5 millimeters.

ALMA 和 GLT 提高了观测的分辨率和灵敏度，并帮助实现了 M87 黑洞周围 3.5 毫米波长的环状结构成像。