helical-shaped bit 螺旋形钻头
chisel-shaped bit 冲击式一字形钻头
bowl shaped bit 碗状钻头
star-shaped bit 星形钻头
shaped insert bit 非球形硬合金齿钻头
shaped bit
的位
以上为机器翻译结果，长、整句建议使用 人工翻译 。
That bit of trickery works because the light can be manipulated when the material is shaped with features about as big as the light's wavelength - less than a millionth of a metre for light that we can see.
BBC: Invisibility cloaking benefits from crystal-clear idea
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