Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Boat in Current: Rowing Speed

船在流中的速度：划行速度

Boat in current as example of relative velocity. Assume the resultant speed and bearing as well as the current speed are known.

Since the velocities form a right triangle, any velocity can be found from the triangle relationships if the other two are known.

船在流水中的例子展示了相对速度。假设结果速度和方向以及水流速度已知。由于速度形成直角三角形，只要知道另外两个速度，就可以从三角形关系中找到任何速度。
Velocity unit
If the current speed is known to be
如果已知速度为
=
and the resultant boat speed is measured to be
并且测得的船速是
=,
then the speed of the boat is
那么船的速度是
 =
and it will be angled downstream at
并且会向下游倾斜
θ = °
Alternate calculations:
其他计算方法：
 Resultant speed and bearing
Resultant speed and bearing（专名或术语）
 Speed of current
电流速度
速度单位
中文译文中的待填/计算数值依次对应：1：u1 2：b 3：u3 4：c 5：u4 6：a 7：u2 8：ac。实际数值以上方原输入框为准。
 Index

Relative velocity
索引 相对速度
  HyperPhysics***** Mechanics
力学
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