Under the bombardment of geopolitical conflicts and rising expectations of the Federal Reserve's interest rate hike, US stocks, which were already booming, have recently been trembling up and down.

In the midst of turbulence, this week's US earnings season ushered in a major quarterly test. Amazon experienced financial quarter losses for the first time in 7 years, and advertising giant Google rarely “exploded”. In contrast, Apple and Microsoft's two “big brothers” are performing much more steadily.