0 one of the most basic forms of matter that make up the heavier elementary particles -- 誇克
1 a type of soft white cheese -- （一種軟質白色乳酪）誇克乳酪
Until a few years ago, it was believed that some experiments showed the existence of "pentaquarks" exotic baryons made of four quarks and one antiquark.
Baryons, along with mesons, are hadrons, meaning they are particles composed of quarks.
Mesons are part of the hadron particle family, defined simply as particles composed of quarks.
The phenomenon of uncertainty takes a quizzical glimpse at quarks and a world in constant flux.
One simple solution exists: if at least one of the quarks of the standard model is massless, becomes unobservable; i.e. it vanishes from the theory.
Thus, the sum of the quarks' spin was expected to be equal to the proton's spin.
Physicists expected that the quarks carry all the proton spin.
They are baryons containing no up or down quarks.
