各活塞间相隔一定距离，并通过连轴互相连接，阀芯与阀杆连成一整体。
The pistons are at certain intervals, and are interconnected via a coupled axle; the valve core and a valve rod are connected into an integrative body.
想象一下，在沙漠中有两个相隔一定距离的水池，此时你有两种完全不同的种植策略。
Imagine a desert with two pools of water separated by some distance. If you're a plant growing next to one of those pools, you can follow one of two different reproductive strategies.
另一种是靶场周围只有两根相隔一定距离的直立标杆，可将红外传感器安装在标杆上，在两标杆之间的区域内形成能被传感器感应到的靶区。
The infrared sensors detects the shells when the fly across the plane. Another design is that there are only two upright poles in the shooting range, the infrared sensors can be fixed on the poles.
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