The plug adapters listed previously with the angled prongs are fine for Mainland China.
Hong Kong uses a "Great Britain" Type plug.
https://www.amazon.com/Ceptics-Hong-Kong-Travel-Adapter/dp/B0080R95XI/I have found the "universal cubes," many with USB chargers, to be finicky beasts. These can be useful in an airport situation if you only have access to one outlet and "must" charge a phone and laptop at the same time. (Generally better to charge the phone from the laptop. Do Lenovo ThinkPad notebooks still have the yellow high current USB connector for faster phone charging?)
I much prefer a few simple adapters. I have carried a small bag essentially consisting of two REI universal plug kits for 20 years of business and personal travel. (
https://www.rei.com/product/775152/rei-co-op-universal-adapter-plug-kit-set-of-4)
For travel en route, most aircraft with power at the seats will have a universal type outlet which will accept a US plug, as will most airline lounges. Outlets in the general concourses will tend to be for the host country.
Most China hotels catering to business and western travelers will have 1 or 2 universal outlets in the desk. I have also seen a simpler "universal outlet" (no ground/earth) in many bathrooms intended for electric shavers. These are usually rated for 100 watts, and will readily handle most laptops and USB chargers.
As several have mentioned, only take a 220 V power strip. Standard US power strips with surge protection will quickly become a smoky mess when the protection circuit "blows" and shorts out the source outlet. You will not be considered a friendly American traveler when you blow the circuit breaker on the airport concourse.
Have FUN for me!