動詞 maintain:

1. keep in a certain state, position, or activity; e.g., "keep clean"
   同義詞：keep, maintain, hold
2. keep in safety and protect from harm, decay, loss, or destruction
   同義詞：conserve, preserve, maintain, keep up
3. supply with necessities and support
   同義詞：sustain, keep, maintain
4. state categorically
   同義詞：assert, asseverate, maintain
5. have and exercise
   同義詞：wield, exert, maintain
6. maintain for use and service
   同義詞：keep, maintain
7. maintain by writing regular records
   同義詞：keep, maintain
8. state or assert
   同義詞：maintain, defend
9. support against an opponent
   同義詞：uphold, maintain
10. observe correctly or closely
    同義詞：observe, keep, maintain

1. The science and art of cultivating, maintaining, and developing forests.
   森林學(xué)有關(guān)耕種、養(yǎng)護和發(fā)展森林的科學(xué)和藝術(shù)
2. The maintaining of one vice costs more than ten virtues.
   保持一樁惡事的代價超過于十件好事。
3. The capturing of prey as a means of maintaining life.
   捕食為生以捕獲獵物作為維持生命的方式
4. How many military bases are they maintaining on foreign soil?
   他們在外國保持多少個軍事基地？