A university education serves not just to educate, but also to signal the ability to learn.
一个大学文凭不单单是对你知识的证明，而且是一个学习能力的信号。
2
Adding to the urgency is the recorders' limited ability to signal their location.
令情况更加紧迫的是，黑匣子发信号显示其位置的能力有限。
3
This study shows that dynamic cues such as dancing ability might also be used to assess male quality in terms of strength and dominance - traits which eventually signal status.