The starting position for the butterfly stroke is: hands about shoulder's width, head looking down at the bottom.
蝶泳划水的起始位置：手大约与肩等宽，眼睛看池底。
The use of worm gear reducer, not only with self-locking butterfly board so that board butterflies stop at any position on, but also to improve the valve performance.
采用蜗轮减速器，不仅可以使蝶板具有自锁能力，使蝶板停止在任意位置上，还能改善阀门的操作性能。
Play great positioning pin ensures disc not because butterfly plate gravity drop, also can be installed in the valve stem end adjustment block to ensure that the butterfly plate fixed position.
弹赞定位销可保证蝶板不会因为蝶板重力作用下坠，还可在下阀杆端部设置调整块来保证蝶板位置固定。
This paper analyzes the failures of air operated double position butterfly valve used in car type furnace, and puts forward improving plan.
本文对台车炉气动双位蝶阀产生的故障进行了分析，并提出了改进方案。
The switch position of butterfly disc is limited by the adjusting screw pole on the worm gear transmission device. The indicating device displays the position of the valve switch.
蝶板的开关位置都由蜗轮传动装置上的调节螺杆限位，指示牌指示阀的开关位置。
Butterfly: a stroke made in the prone position where both arms are lifted simultaneously out of the water and flung forward, in combination with the dolphin kick.
蝶泳：一种泳姿。即采用俯卧姿势，双臂同时在水面之上前挥划水，结合身体做海豚式打水。
The tracking control technique of triple eccentric butterfly valve is introduced. The detection position and the effect of displacement sensor are discussed in this paper.
论述了三偏心蝶阀焊缝跟踪控制方法，分析了位移传感器的检测位置及其效果。
The tracking control technique of triple eccentric butterfly valve is introduced. The detection position and the effect of displacement sensor are discussed in this paper.
论述了三偏心蝶阀焊缝跟踪控制方法，分析了位移传感器的检测位置及其效果。
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