lo

看哪、瞧旧式

And lo, the whole crowd fell silent as she stepped forward.

看哪，她一走上前，全场群众便安静下来。

没想到、你瞧口语

I opened the box and, lo and behold, the missing keys were inside.

我打开盒子，没想到不见的钥匙就在里面。