Definition (認識)
To recognize someone visually but not personally; to be familiar with someone's appearance without knowing them well.
（對某人）面熟
I see him at the gym occasionally, but I only know him by sight.
我偶爾在健身房看到他，但我只是面熟他。
I know the new neighbor by sight, but I haven't had a chance to meet them properly.
我對新鄰居面熟，但我還沒有機會好好認識他們。
Although I only knew her by sight, I think I remember her working at that coffee shop.
雖然我只是對她面熟，但我記得她在那家咖啡店工作。