The emphasis in planetary exploration is thus shifting from reconnaissance to a new era of prolonged and systematic investigation.

The official, Volker Foertsch, was subjected to a prolonged investigation.

G.M. cautiously welcomed today's announcement of the indictment, which came after a prolonged investigation.

Their lack of knowledge about education and poor record keeping skills create prolonged and inconclusive investigations.

The prolonged investigation and the inconclusive outcome have caused bureaucratic battles within the Navy.

The prolonged investigation and the Barrett report have been the subjects of intense partisan battles.

But the biggest cloud hanging over Marsh is the potential damage to profits that could result from a prolonged investigation into insurance broker contingency fees.

Armstrong states that science can achieve consensus among experts on controversial matters after prolonged investigation.

Hundreds of millions of dollars have been spent on prolonged investigations since the law was enacted.

After prolonged investigation, a poorly performing fuel pump was identified as the cause of the lacklustre performance.