Word

HSK	Not in HSK
FREQUENCY	Unknown

彩虹行动 cǎi hóng xíng dòng

the two mass scuttling operations carried out by the German navy: the scuttling of the German fleet at Scapa Flow in 1919 and Operation Regenbogen, the scuttling of U-boats in 1945

彩 cǎi HSK 4	hue, color; variegated colors
虹 hóng HSK 5	rainbow
行 xíng HSK 3	go; walk; move, travel; circulate
动 dòng HSK 2	move, happen; movement, action