purchase of grain by the state; buy grain on a requisition basis; purchase of grain by the state on fixed quotas; sell agricultural products to the state by assigned quotas; quotas of grain purchased by the state是什么意思_purchase of grain by the state; buy grain on a requisition basis; purchase of grain by the state on fixed quotas; sell agricultural products to the state by assigned quotas; quotas of grain purchased by the state在线翻译_英语_读音_用法_例句