source: [lemma=remain] □ □
destination: [lemma=remain] □ □ □
spec: Since it is hard to explain the doctrine , the yogi should pay special attention to it . In the April 14 issue of Nature , scientists describe a polymer that undergoes lasing action at lower operating powers than previously observed , and they demonstrate that the stimulated light emission from the lasing modes of the polymer displays inherently greater sensitivity to explosives vapors . In the ARIES study , the careful measurement of other urban pollutants suggests that carbon monoxide and carbon-based PM2.5 remain associated with some health problems . It was fitting that the men whose names will remain associated with the extirpation , from the democratic soil of America , of the aristocracy of color , should be among the originators , for America and for the rest of the world , of the first collective protest against the aristocracy of sex ; a distinction as accidental as that of color , and fully as irrelevant to all questions of government .