I can tell by your body language that you're happy with the decision.

我能从你的身体语言看出来你对这个决定感到满意。

《柯林斯英汉双解大词典》

I could tell by the look on her face that something terrible had happened.

从她的脸色我可以看出，发生了可怕的事情。

《牛津词典》

Though she couldn't see his face, she could tell by his voice that he was young.

虽然她看不见他的脸，但从他的声音可以听出来他很年轻。

youdao

"If they can get the work done and walk into your casting office and you cannot tell by looking at them that they've had anything done,that's O.K."

VOA: standard.2010.07.22

Well,you can't tell by thinking about the normal case, because the B-functioning and the P-functioning stop at the same time.

这从通常的例子中是研究不出来的，因为生理功能和人格功能同时结束。

耶鲁公开课 - 死亡课程节选

Can you tell us about music and art performed and shown by African Americans?

能给我们讲讲美国黑人表演的音乐和展现的艺术吗？

关于黑人文化 - SpeakingMax英语口语达人

And you could tell by the people he had on his staff: Ken Mehlman.

NPR: Karl Rove is Out

Even the Chelsea players knew, you could tell by their reaction it was a penalty.

BBC: Fuming O'Neill blasts John Terry tackle on James Milner

"We can definitely tell by taking measurements under the gums each visit, " Dr. Weisz says.

WSJ: When Patients Lie to the Doctor