信守诺言; 遵守诺言，履行诺言; [经] 守约; 践约

1. 遵守诺言：make a promise许下诺言 | keep a promise遵守诺言 | carry out a promise履行诺言

2. 履行诺言：遵守合同 keep a contract | 履行诺言 keep a promise | 记帐 keep accounts

3. 遵守诺言,信守诺言：keep a certain distance 保持一定距离 | keep a promise 遵守诺言,信守诺言 | keep a record (of sth.) 作记录

4. 守信：break a promise 不守信 | keep a promise 守信 | make a promise 答应,许诺