All my childhood, discarded imperfect ballbearings rolled down the hill into our yard.
在我的童年时代里，经常有不合格的轴承被丢出来，顺着山坡滚到我们院子里。
2
And it holds true to business buying from ballbearings, to semiconductors, to transportation and financial services.
而且，它还对一些商业采购行为有效用，不管是采购滚珠轴承、半导体，还是交通与金融服务。
3
Chan realized he could solve the problem by imagining his cylinder full of ballbearings as a stack of disks, with a single layer of ballbearings on each disk.