Concentrationof the samurai in castle-towns had acted as a stimulus to trade.
武士在城堡城镇的集中刺激了贸易的发展。
2
But here the issue is concentration: on 2008 figures, the Rio-BHP venture would leapfrog over Vale of Brazil to take the top spot and amount to more than 35 per cent of global seaborne iron ore trade.