Today, while sitting with my son, an ice cream cone landed on my head from out of no where.
今天和儿子在一起坐着的时候，突然一只蛋筒冰淇淋落在我头上。
2
The equations is used whether roller is column or cone, cam is in spine or groove location, left or right helical, single head or many heads and how it is turning.
该方程适用于滚子为柱型或锥型凸轮为槽定位或脊定位、单头或多头、左旋或右旋、上转或下转的情况。
3
Conehead drive screw with washer - used on roof for keeping fixing holes watertight.