In this exercise of classification that brain is being put to strenuous use, because the particular characteristics are so variable that scientists today define mammals not using physical criteria but evolutionary origins: "All mammals alive today descended from a single, shared ancestor".
"Philosophies work very well when they're not put to a strenuous test.
With 663,000 more jobs disappearing from the American economy last month, swelling the total number of jobs surrendered to the recession beyond five million, the government's response to the downturn is being put to a strenuous test.
They also put the players through strenuous predraft interviews and psychological testing.
It's about a 34-course eating experience, far too rarified and polytextural to be called anything as mundane as "dinner", in which the human tastebuds are put through the most strenuous workout of their lives.
Few had taken at face value the strenuous bonhomie put on show during the German election campaign by Gerhard Schröder, the chancellor-designate, Oskar Lafontaine, the party's chairman, and Rudolf Scharping, its parliamentary leader.
As Thompson and Green stressed, the team put the device through strenuous safety tests, including at the University of Michigan's crash labs, to ensure that it wouldn't break in case of a crash (the outside is made of a hard plastic with metal on the inside) and wouldn't start sending false alerts either.
This led to the lightly heralded Johan Vansummeren from Hushovd's team winning the race from a solo escape, but Ballan was able to finish sixth by staying with Cancellara as best he could, losing contact only when Cancellara put in his most strenuous attack near the finish.
Long before the two crossed paths at the office, Platt, then a graduate student at Cambridge, picked up Muldoon's 1981 collection "Why Brownlee Left," choosing the poems "Cuba" and "Bran" to embark on, as he puts it, "a strenuous attempt to realize poetic detail in musical gesture, to grow decadent ivy around Paul's magnificent trellis of words".
Though strenuous effort has put Doha back on track, agriculture remains a sticking point between the rich, mostly northern countries and the poorer, mostly southern ones.
