维持

Friendship can no longer be maintained between us.

The railway is maintained with public money.

have enough food to get to the end of the year

rigidly maintain discipline

be hard to get by in life

make a bare/slender/scanty livelihood; scrape a living

keep peace and order

keep/maintain order

affirm the original judgement; uphold a lower court's ruling; uphold the original verdict

maintain the status quo

maintain prices

conserve/preserve/maintain one's strength

maintain the market

support/sustain/maintain life; subsist (on); keep body and soul together

maintain one's livelihood; get a maintenance (from)

keep body and soul together; support oneself or one's family

keep/maintain peace

Due to the official's cover-up, the criminal went unpunished.