Definition
upon initial observation or viewing
初看之下；乍看之下
At first glance, I thought it was a dog (but I was mistaken).
乍看之下，我以为那是一只狗（但我错了）。
At first glance, they seem like an unlikely couple.
乍看之下，他们似乎是一对不太可能的夫妻。
At first glance, that house looks like the one I grew up in. But looking more closely, it's definitely bigger and has a different door.
乍看之下，那栋房子看起来像我长大的那栋。但仔细看，它肯定更大，门也不一样。