There are 2 radiologic signs of dural ossification, namely, the tram track sign and the comma sign.

硬膜骨化有2个影像学征象，即轨道征和逗点征。

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Guests are returning in increasing numbers – a sure sign that we are on the right track.

回头客越来越多–一个我们做得对的确凿迹象。

《柯林斯英汉双解大词典》

StockTwits, for example, is an online community of investors where users sign in with their Twitter account to keep track of stock-related news.

举例来说，StockT wits，一个可以用t witter用户名登陆的在线社区，投资者可以在上面追踪与股票有关的新闻。

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You add them all up algebraically, keeping track of their sign, and that's the total force.

你再对这些力做代数加法,注意符号,就求出合力了

耶鲁公开课 - 基础物理课程节选

So the sign of the number is adequate to keep track of my motion.

所以数字的符号对于记录运动足够了

耶鲁公开课 - 基础物理课程节选

Remember, you've got to keep track of the sign of acceleration, so if you're picking up speed towards the ground, a is negative, so it will be g plus a, but a is a negative number.

记住,一定要注意加速度的符号,所以当你加速下降的时候,a 是负的,还是 g 加上 a,但是 a 是负数

耶鲁公开课 - 基础物理课程节选

There was enough to be learned even through failure that a track record of multiple startups was a good sign.

FORBES: Entrepreneurs are the New Labor: Part II

Do Not Track would not be a list that you sign up for, and it would be more granular in application.

FORBES: How Would a 'Do Not Track' Mechanism for Online Privacy Work?

The Liz Squad took that as a sign their work was on the right track.

CNN: Meet Elizabeth: The heart and soul of 'BioShock Infinite'