The cycle frequency of jet fluid swing is half of that of tangential circle rotation.
相应切圆呈周期性旋转，射流摆动也具有周期性，该周期是切圆旋转周期的一半。
The back had a gravel driveway with a four-car garage, a nice lawn with a swing set, and, on both sides of the driveway, sloping lawns that went down to the street, Circle drive.
房子后面有一条碎石铺成的车道，一个可停放四辆车的车库，一块漂亮的草坪，草坪上立着秋千架，车道两边则是草坪坡地，一直延伸到环路街上。
The back had a gravel driveway with a four-car garage, a nice lawn with a swing set, and, on both sides of the driveway, sloping lawns that went down to the street, Circle drive.
房子后面有一条碎石铺成的车道，一个可停放四辆车的车库，一块漂亮的草坪，草坪上立着秋千架，车道两边则是草坪坡地，一直延伸到环路街上。
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