三七开

三七开	sān qī kāi	ratio seventy to thirty / thirty percent failure, seventy percent success
三	Sān	surname San
三	sān	three / 3
三七	sān qī	pseudoginseng (Panax pseudoginseng), hemostatic herb
七	qī	seven / 7
开	kāi	to open (transitive or intransitive) / (of ships, vehicles, troops etc) to start / to turn on; to put in operation; to operate; to run / to boil / to write out (a prescription, check, invoice etc) / (directional complement) away; off / carat (gold) / abbr. for Kelvin, 开尔文 / abbr. for 开本, book format