1. legion   noun   

原句: Legions of fishermen piled into boats and killed thousands of the ocean predators in shark fishing tournaments.

意思: a large number of people

字源: Middle English: via Old French from Latin legio(n-), from legere ‘choose, levy’. The adjective dates from the late 17th cent., in early use often in the phrase my, their, etc. name is legion, i.e. ‘we, they, etc. are many’ (Mark 5:9) in the Bible. 

例句: The French Foreign Legion had taken control of much of the country.

1. vigorous   adjective   

原句: About one-fourth of the players wore accelerometers during practices to calculate how much of the time they were moderately to vigorously active.

意思:
a. very active, determined or full of energy
b. strong and healthy

字源: Middle English: via Old French from medieval Latin vigorosus, from Latin vigor, from vigere ‘be lively’. 

例句:
a. Take vigorous exercise for several hours a week.
b. This plant is a vigorous grower.