Noun + 上
The particle 上 (shàng) can mean "on the basis of," "in terms of," or "in the aspect of" when placed after a noun to indicate a domain or perspective. This usage is common in formal writing to specify the framework within which something applies. For example, 宪法上 means "constitutionally" or "on a constitutional basis."
理论上这个方法是可行的,但实际操作很难。
lǐlùn shàng zhège fāngfǎ shì kěxíng de, dàn shíjì cāozuò hěn nán.
In theory this method is feasible, but it's very difficult in practice.
这些权利在宪法上是受到保护的。
zhèxiē quánlì zài xiànfǎ shàng shì shòudào bǎohù de.
These rights are protected under the constitution.
经济上他没有什么压力,生活过得很轻松。
jīngjì shàng tā méiyǒu shénme yālì, shēnghuó guò de hěn qīngsōng.
He has no financial pressure and lives a very relaxed life.