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先进水平，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 advanced level, the total cost of a ton of exports of goods in port each carrier 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 advanced level of the world, the port each carrier a ton of exports of goods than the total cost was 30 years ago-more than 20 per cent.

正在翻译，请等待...

At present, China's coastal ports of loading and unloading efficiency are at the world's advanced level of technology and service, port of shipping a ton of exported goods have lower total cost than they were 30 years ago over 20%.

At present, the Chinese coast harbor loading and unloading technology and the service efficiency were in the world advanced level, 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.