例句與造句

1. If a pendulum was built with a second adjustable pivot point near the bottom so it could be hung upside down, and the second pivot was adjusted until the periods when hung from both pivots were the same, the second pivot would be at the center of oscillation, and the distance between the two pivots would be the length " L " of a simple pendulum with the same period.
2. If a pendulum was built with a second adjustable pivot point near the bottom so it could be hung upside down, and the second pivot was adjusted until the periods when hung from both pivots were the same, the second pivot would be at the center of oscillation, and the distance between the two pivots would be the length " L " of a simple pendulum with the same period.
3. Quoted directly from the Snakeboard patent Abstract and Claims : " This invention relates to a skateboard comprising two footboards each of the footboards including a foot platform and wheel-set which carries two wheels in axial alignment fixed to the underside of the platform, a spacer element for holding the footboards in a spaced relationship and a pivot arrangement having a vertical pivot axis connecting each footboard to the spacer element to enable both footboards to pivot relatively to the spacer element, each wheel set including a wheel body, wheel axles which are fixed to and project from the opposite sides of the body with the wheels being journaled for rotation on the axles, a first pivot pin being attached to the wheel body with its axis in a vertical direction, a support member on the wheel body, a second pivot pin pivotally connecting the foot platform to the support member with its pivot axis normal to the wheel axis, and resilient suspension means between the support member and the underside of the foot platform for holding the platform horizontal, said pivot arrangement being pivotally engaged with the first pivot pin ."
4. It's difficult to find second pivot in a sentence. 用second pivot造句挺難的