• 守信
• 守信用

keep up保持 继续 维持 跟上(时代)keepv.保持；保留；继续；贮藏；经营；遵守；供给；照管；饲养；耽搁；保持食物不变质；健康状况如何；保守（秘密@）；记录；遵守；保护n.生计；保存；城堡主楼；监狱；围墙keep one's eyes open内龙骨板keep-alive current保活电流Keep up your courage!不要气馁！keep under detention[法] 看押keep one's composuren.[船]龙骨墩keep a tight rein onvt.约束Keeping up with time与时俱进keep upon one's legs龙骨板,平板龙骨keep up sb's courage龙骨拱顶keep a tranquil mind保持宁静的心境

1. It is important that you keep your word.
   你要守信这很重要。
2. He makes a religion of keeping faith with his friends.
   他把封朋友守信作为信条。