粒の大きい大豆から油を搾るのか大変。大量に油が搾れるのは蒸気機関ができてから🚂 It is difficult to extract oil from large soybeans. It wasn't until the creation of the steam engine that large amounts of oil could be extracted.🚂 從大大豆中提取油是很困難的。 直到蒸氣機的發明，才可以提取大量的石油🚂 。