flat and cone top cans 扁平罐和漏斗罐
But the dolphin has a bottle-shaped nose and cone-shaped teeth while the porpoise has a flat nose and chisel-shaped teeth.
但是“dolphin”有长圆形的鼻子和锥形的牙齿，而“porpoise”的鼻子却是扁平形，牙齿是凿形的。
Based on the geometrical relation between tappets and cams, uniform formulas for mutual lift-range transition between flat based tappet, roller (or sphere) tappet and cone tappet were presented.
通过分析不同从动件与凸轮的几何关系，推导出一组平底挺杆、滚子或球面挺杆、尖锥挺杆升程的相互转换通用公式。
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