单语范例（未经PONS编辑处理）
They are the building blocks of the hadrons.
en.wikipedia.org Sea quarks are much less stable than their valence counterparts, and they typically annihilate each other within the interior of the hadron.
en.wikipedia.org However, color-charged particles may combine to form color neutral composite particles called hadrons.
en.wikipedia.org With the invention of bubble chambers and spark chambers in the 1950s, experimental particle physics discovered a large and ever-growing number of particles called hadrons.
en.wikipedia.org The most important hadrons are protons and neutrons, the basic constituents of atomic nuclei and, therefore, the building blocks of ordinary matter.
en.wikipedia.org