PATRICK LANDMANN / SCIENCE PHOTO LIBRARY PATRICK LANDMANN / SCIENCE PHOTO LIBRARY
Yangshan Port, China. Close-up of a 'tonnage due' certificate at the Yangshan Deep-Water Port, Hangzhou Bay, China. In China, the commander of the ship must pay a fee based on the 'deadweight tonnage' (dwt), which is a measure of how much weight a ship is carrying or can safely carry.
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