约翰先生没有在港口卸货的准备，因此遇到了很大的麻烦，只能承担这部分额外费用。
Sir John had not been prepared to unload at the port and had to bear extra costs for the difficulties.
巴西最大港口Santos的外海，等待卸货的轮船大排长龙。
Off Santos, Brazil's biggest port, a line of ships queuing to load stretches to the horizon.
这个港口的卸货速率是多少?。
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