单语范例（未经PONS编辑处理）
Night harassment and interdiction fire against unobserved area targets comprised the majority of the missions.
en.wikipedia.org The equation also implied the existence of a new form of matter, "antimatter", hitherto unsuspected and unobserved, and actually predated its experimental discovery.
en.wikipedia.org Compared to the hoo-ha over his completion of 100 days, then one year, then two years, this milestone passed unobserved.
www.ndtv.com Direct maximization of the likelihood (or of the posterior probability) is often complex when there are unobserved variables.
en.wikipedia.org Wherever the water in its overflow reaches, men take knowledge of it, while the fattening rain falls unobserved.
en.wikipedia.org