... tack hole 铆钉孔 tack line 信号旗组间隔绳 tack pin 系索栓 ...
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Now, Prof Smith and his Duke colleague Nathan Landy have taken another tack, reworking how the edges of a microwave cloak line up, ensuring that the light passes around the cloak completely with no reflections.
BBC: Invisibility cloaking in 'perfect' demonstration
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