守信用的英文：
keep faith
keep one's word

参考例句：

Keep one's word; keep one's promise
守约;守信用

Only the person who has faith in himself is able to be faithful to others. --Erich Fromm
只有对自己有信心的人才会对别人守信用。　--埃立克·弗洛姆

Abide by the contract and keep promises
重合同、守信用

We always carry out the terms of our contract to the letter and stand by what we say.
我们坚持重合同,守信用

It is better to be faithful than famous. -- T. Roosevelt
守信用胜过有名气。--罗斯福

The principle of equality and mutual benefit and "honoring contracts and standing by reputation"
平等互利及重合同、守信用的原则

He always keeps faith with his friends.
他对朋友一向守信用。

China is a trustworthy and responsible country
中国是守信用、负责任的国家。

The Businessman was known for keeping his word.
大家都知道那位生意人是很守信用的。

Only the person who has faith in himself is able to be faithful to others．
只有对自己有信心的人才会对别人守信用。

keep是什么意思：
v. 保持，处于；继续，重复；使耽搁；抚养；履行
n. 生活费，生活必需品

That news will keep.
那个消息留待以后再宣布。

They keep a shop.
他们经营一家商店。

How are you keeping?
你最近还好吧？

faith是什么意思：
n. 信任，相信，宗教信仰，宗教，诚意，善意

As faithful as a dog.
像狗一般的忠诚。

"in faith (=by my faith, upon my faith)"
实在!说实话!说真的!的确!

Faith, which does not doubt is a dead faith.
没有怀疑的信念是无生命的信念。

one是什么意思：
num. 一；同一个、最重要的一个
det. 代替a或an，表示强调；某位（用于不太熟悉之人的姓名之前）
pron. 任何人；一个人；一个事物；其中的一个人

One, Taipei, one way.
台北单程票一张。

This one is not a spoof.
这个就不是开玩笑了。

One and one make(s) two.
一加一等于二。