Translation of "Observing" in Chinese

The lonely man derives pleasure from observing ants.

那个孤僻的人以观察蚂蚁取乐。

We're interested in observing the customs of different regions.

我们对观察不同地区的风俗感兴趣。

But the butcher is observing the holiday today, there's nothing we can do about it.

可是肉店今天公休沒辦法。