A pair of American Apparel tube socks. See here.

一双美国筒袜，如图。

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Like: what the rest of the eight CARDS (should play a favorite) : a tube of a pair, six, seven, seventy thousand, four, five, and a whiteboard.

又如：究竟所剩的八张牌(应当打出一张时)为：一筒一对，六、七、七万，四、五索，及白板。

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As a very crude approach to reconstructing a scan raster on the TV tube, these pulses can be stripped off and individually utilized to trigger a pair of single sweep generators.

作为一种非常粗糙的重建电视显像管扫描光栅的方法，这些脉冲可以剥离出来单独用于触发一对扫描发生器。

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For example, just before the start of spring training, he tweeted a photo of himself shirtless in a swimming pool, buoyed by a tube and a pair of floaties, with goggles over his eyes and a snorkel lodged in his mouth.

WSJ: The King of the Accidental Phone Call

Three strands of DNA were synthesized so that when they were put into a test tube, they immediately became a molecular motor--a pair of DNA tweezers, held together at one end by a third piece of DNA that could be made to open and shut by adding or subtracting a fourth DNA strand.

FORBES: DNA May Make Computers, Not Run Them