Definition (承諾)
To fulfill a commitment or assurance given to someone.
信守諾言；履行諾言
She promised her children she would take them to the park if they behaved, and she kept her word.
她答應孩子們如果他們表現好就帶他們去公園，她信守了承諾。
The company promised excellent after-sales service, and they kept their promise.
公司承諾提供優質的售後服務，他們信守了承諾。
He promised to keep the secret, and he kept his word by never telling anyone.
他答應保守秘密，並且信守承諾從未告訴任何人。