受实船试航水域水深的影响，对于深吃水的大型船舶航速测量结果必须采用适当的方法进行航速的浅水修正。
Influenced by the water depth of ship sea trial area, velocity measurement of deep-draft large-scale ship should be shallow-water corrected with proper method.
相对大型船舶船宽大、吃水深的特点，港口内一般水深相对较浅、宽度受限。
Considering the large vessels have big breadth and deep draft, the depth and the width of ports area are limited.
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