中国有BTA，美国有GAFA

GAFA is the corporations Google, Apple, Facebook, and Amazon viewed as a group, particularly one that wields significant power and influence in modern affairs.

GAFA是指谷歌、苹果、脸书和亚马逊四大巨头，这四家公司势力极大，而且对现代事物有着重要影响。

The four so-called "Internet giants," also known as GAFA (Google, Apple, Facebook, Amazon), now have a total revenue equivalent to Denmark’s entire GDP at around $316 billion.

四大互联网巨头GAFA(谷歌、苹果、脸书、亚马逊)目前总收入已达3160亿美元，相当于丹麦的GDP总额。