圆边扁钢
圆边击平锤
圆边砂轮
Tim swears he's seen a round-edged disc in the wild, but we've never seen such a thing ourselves.
ENGADGET: Take a very, very close look at the round-edged Wii U proprietary discs
Of course, all logic and statistics aside, having now handled a round-edged disc, we never wanna go back.
Many batteries are made in a kind of "Swiss roll" geometry, in which the layers are rolled up into a cylindrical or round-edged rectangular shape.
BBC: 'Paint-on' batteries demonstrated
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