He could tell at a glance what was wrong.

他一眼就看出了问题所在。

《牛津词典》

One could tell at a glance that she was a compassionate person.

一眼就能看出她是一个富有同情心的人。

《柯林斯英汉双解大词典》

Can you tell at a glance what it is?

你能一眼看出那是什么吗？

youdao

It's easy to tell a Journe watch at a glance--his pieces don't look like anybody else's.

FORBES: Magazine Article

They're usually familiar with them already but, at a glance, they can tell if their money is being put to good use.

FORBES: The Matchmaker

This did not strike me as unusual: Iranians often talk to strangers at such length, and with such warmth, that at a glance it is hard to tell old friends from people who have just met.

NEWYORKER: Election, Monitored