['Voyager', 'keep', 'lock', 'they', 'on']
['<VESSEL>1', 'keep-15.2', "Synset('device.n.01')", '<PRP>', 'on']
Voyager keeps a sensor lock on them.
<VESSEL>1 keeps a Synset('instrumentality.n.03') Synset('device.n.01') on <PRP>.