"KK飞控是源于韩国的一款开源飞控项目", it means "KK flight control is an open-source flight control project from (South) Korea". The translation is correct. Seems that the author knows nothing more that copy/paste others…"
"Just for the fc:
1. Sophisticated control algorithms other than simple PID, e.g. some adaptable controller.
2. Expensive high end MEMS sensors,compared to those cheap gyros used in cellphones. And very likely those expensive sensors are well…"
"The green Chinese characters in the first pic means:
The solder pad pointed by the arrow here has the same functionality as the JP2 jumper on an APM. It is used for firmware upgrade.
And white in the second pic:
Telemetry port, pins from left to…"
"This clone is still in pre-order. However, the (pre-order)price is China is cheaper than $180. Also it's pre-loaded with OTP data, so it's easier to upgrade firmware in MP. This manufacturer is famous for its high quality APM clones…"