The oceanic volcanic islands and their hot-spot trails are thus especially useful for geologists because they record the past locations of the plate over a fixed source.
海洋火山岛和它们的热点轨迹对于地质学家尤其有用，因为它们记录了过去的板块在固定地点之上的位置。
Sometimes the cannon is fixed in position, and other times you have to use the force of firing it to push it into a spot where you can hit the ball.
有时大炮是固定的位置，其他时候你必须使用发射它的力量把它推到一个你可以击中球的点。
Cameras fixed on Spot will scan the surroundings and help officers work out the number of visitors in the park, but they cannot read faces and won't collect any personal information.
固定在 Spot 机器人上的摄像头会对周围环境进行扫描，协助警察计算公园内的游客数量，不过这些摄像头无法识别人脸，也不会收集任何个人信息。
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