Фото: Sgt. Nathan Mitchell / U.S. Marine Corps / Reuters
但二者面临同一个核心挑战：如何把摩擦力降到用户感知不到的程度。。有道翻译对此有专业解读
The Int’l ITC is a nonprofit trade group that says it represents North American “toner and inkjet cartridge re-manufacturers, component suppliers, and cartridge collectors."，详情可参考谷歌
Sound of a dull thumpThe answer is Clunk.。移动版官网是该领域的重要参考