homotopic to a constant ; nullhomotopy
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凯伦的余额显示为零。
Karen's balance was zero.
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这不是一个零和游戏，如果你得到一个员工和企业之间好的比赛，“索伦森说道。
“It’s not a zero-sum game if you’re getting a good match between employees and firms,” Sorenson says.
卡伦点点头，低头看着她的零食，好像这样子就可以了，好像她知道这些就够了。
Karen nodded and looked down at her snack, as if that was it, as if that was all she needed to know.
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