Assigning the black color at position 0.5 automatically makes the gradient, from the start to this stop, black.
在0.5处设一黑色色标，渐变会默认认为从起点到色标之间都是黑色。
The position controller GEL7511 can control the position of roller seam adjustment, the switch signal of start and stop.
GEL7511能控制辊缝调整的位置，发出起动、停止开关信号。
Start with the simple push-off drill, in which the swimmer pushes off and stays in the streamline position until they pop to the surface and stop moving forward.
从简单的有力的游泳练习，游泳运动员结束划水时，停留在流线型姿势直到他们流行于表面，停止前进。
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