[word=summoned | lemma=experience] | [tag=□] □
[word=summoned | lemma=experience] | [tag=NN] □
[word=summoned | lemma=experience] | [tag=IN] □
The invention of a three field system of crop rotation during the Middle Ages , and the importation of the Chinese-invented moldboard plow , vastly improved agricultural efficiency.After 1492 , a global exchange of previously local crops and livestock breeds occurred . Anyone with a messianic zeal about any of these candidates is going to be disappointed in the end . The whole of a kingdom , or rather of an Empire , united for once in spirit , has entered with enthusiasm upon an arduous conflict with a nation possessed of the largest and the most highly trained army which the modern world can produce . The UK groups are positioning themselves to make a very substantial contribution to this next experiment with serious consideration being given to the Boulby mine as a location . Unfortunately , in the current state of the art , localization via the POSIX model is something of a Procrustean bed .