(四) The imbalance of supply and demand for resources between regions of the world is one of the main drivers of trade.

2.Please translate the following sentences into Chinese. (一) Bill of lading (BL), is a legal document issued by a carrier to a shipper that details the type, quantity, and destination of the goods being carried. A bill of lading also serves as a shipment receipt when the carrier delivers the goods at a predetermined destination.