It is an important way for improving the rapidity of a displacement craft to adopt tunnel stern and increase propeller diameter.
采用隧道尾而增大螺旋桨直径，是提高排水型快艇快速性能的一条重要途径。
The key problem in the hull form design for a high speed round bilge displacement craft is to select an appropriate afterbody form.
高速圆舭排水艇的船型设计，关键是合理选择尾部线型。
The word "vessel" includes every description of watercraft, including non-displacement craft and seaplanes, used or capable of being used as a means of transportation on water.
船舶一词，指用作或者能够用作水上运输工具的各类水上船筏，包括非排水船舶和水上飞机。
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