If you had a motor here that was causing a paddle to move up and down you could cause waves to form at one end of the tank and move from left to right.

如果这里有一个马达，使桨上下移动，就可以在水槽的一端形成波浪，从左到右扩散。

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Many outboard brackets, like the one shown here, can be moved up and down to raise and lower the motor.

许多舷外发动机支撑臂，就像上图中所示的那个一样，可以上下移动以使发动机抬起或下降。

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A few years into their retirement they "sold everything they owned", bought a motor home, and drove it for more than a decade up, down and across America.

退休几年后，他们卖掉了“所有的一切”，买了一辆移动居住车，此后十多年里，他们驱车走遍美国。

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This was solved by rotating the craft through a right angle, so that panning was possible with the motor that had previously been used for up-and-down movement.

ECONOMIST: The long arm of the celestial repairman