Such triple systems appear to be extremely rare—only four are known.

这种拥有三个黑洞的银河系十分少见，目前只发现了四个。

Welch said that Earendel may have been the main star in a two-star system, or possibly even a triple- or quadruple-star system.

韦尔奇说，厄尔伦德尔可能是双星系统的主星，甚至可能是三星或四星系统的主星。

And, the gorgeous Pixel 7 Pro, in its triple camera system, sets a completely new standard for photography, performance, and design.

而且， 华丽的 Pixel 7 Pro 在其三摄像头系统中为摄影、性能和设计树立了全新的标准。