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: Speed of Current

船在流水中：水流速度

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

船在流水中的例子是相对速度。假设已知结果速度和航向以及在静水中划船的速度。

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

由于速度构成直角三角形，若已知另外两个速度，即可从三角形关系中求出任意一个速度。
Velocity unit
If the rowing speed is known to be
若已知划船的速率是
=
and the resultant boat speed is measured to be
并且测得的船速是
 =,
Then the current speed is
然后电流的速率是
 =
and the boat will be angled downstream at θ =
并且船将被向下偏转角度θ =
°
Alternate calculations:
其他计算方法：
 Resultant speed and bearing
Resultant speed and bearing（专名或术语）
 Rowing speed
划船速度
速度单位
中文译文中的待填/计算数值依次对应：1：u1 2：a 3：u2 4：c 5：u4 6：b 7：u3 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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