button knot
按钮结
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He had slept little, but the knot of his red tie was predictably flush against the top button.
WSJ: Jason Gay: The Heart of a Giant Win
If I have an appointment that requires me to wear a tie, I push a button and the 2-inch color LCD screen turns into a mirror I can use to check the knot.
FORBES: 3G Phone
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