求翻译：目前，中国沿海港口的装卸技术和服务效率均处于世界前列，港口每承运一吨出口货物的总成本比30年前低了20%以上。是什么意思？

At present, China's coastal ports handling technology and service efficiency in the world, the total cost of the port each carriage of a ton of exports of goods more than 20% less than 30 years ago.

At present, China's coastal port of loading or unloading technology and efficiency of the services are in the forefront of the world, and a ton of port each carrier of the export of the goods total cost less than 30 years ago by more than 20 percent.

At present, the Chinese coast harbor loading and unloading technology and the service efficiency were in the world front row, the harbor undertake to transport a ton to export the cargo every time the total cost to lower above 20% compared to 30 years ago.

At present, China's coastal ports of loading and unloading technology and efficiency in the world, port each total cost of shipping a ton of exported goods more than 20% less than 30 years ago.

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