A reasonable structure of table index could accelerate data search speed.
合理构造表索引将有效提高数据库查询速度。
The rotary table top can mechanically or manually rotate, can rotate forward and backward freely, rotate and stop automatically, and can accelerate or decelerate or even stop rotating.
该旋转台面可机动或手动旋转，可任意正、反旋转、自动停停走走，加速或减速甚至停止旋转。
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