您要查找的是不是：
- pendulum bob rod 摆杆
- The mass of the pendulum bob does not change from one location to another on the earth's surface. 摆锤的质量在地面各处都一样。
- When pulled to one side of its equilibrium position and released, the pendulum bob vibrates about this position. 把此质点作为摆锤拉到平衡位置的一侧，然后释放，摆锤就在平衡位置附近摆动。
- Two-dimensional Vibration of a Pendulum Bob 摆球的二维摆动
- Bob rode his horse to a standstill. 鲍勃把马骑得走不动了。
- Most things which are heated expand. If we heat the rod of a pendulum,it expands. So the bob moves down to a lower place. Then the clock goes more slowly than before. 大多数的东西受热后便会膨胀，如果我们加热摆杆，它也会膨胀，这样摆锤就会降低一些，那么钟速就会比以前慢了。
- Bob often stirs up a fight between the two boys. 鲍勃经常煽动这两个孩子打架。
- Bob teed off on the new pitcher's first delivery. 鲍勃猛击那新投手所投的第一个球。
- When we make the rod shorter, the pendulum vibrates faster. 金属杆越短，摆摆动的速度越快；
- The pendulum of the clock in my room is a bear. 我房间的钟摆是小熊形状的。
- I bought a new fishing rod last Sunday. 上星期日我新买了一个鱼竿。
- Bob pecked at the hard ground with a pickaxe. 鲍勃用鹤嘴锄在坚硬的地面上挖掘。
- Bob is a fool, to be dozing at the very nonce. 鲍勃真是个笨蛋，在这个节骨眼上还打瞌睡。
- Bob lit up one of his best Havana. 鲍勃点燃了一只他最好的哈瓦那烟。
- Bill and Bob are boon companions. 比尔和鲍勃是很合得来的朋友。
- When we make the rod shorter,the pendulum vibrates faster. 金属杆越短，摆摆动的速度越快。
- Bob tuned in his portable radio to a record show. 鲍伯收听手提收音机的唱片广播。
- The movable target on a leveling rod. 视准器水准尺上可移动的目标
- Bob began to go into the details of the question. 鲍勃开始深入调查这问题的细节。
- The rod bent as he pulled in the fish. 当他把鱼拉上来时，鱼竿都弯了。
