1、promise

承诺；保证；答应

The post office has promised to resume first class mail delivery to the area on Friday.

邮局承诺于星期五恢复对这个地区第一类邮件的递送。

He had promised that the rich and privileged would no longer get preferential treatment.

他已经保证富人和特权阶层不会再得到优惠待遇。

答应给予；承诺给予；保证让…得到

In 1920 the great powers promised them an independent state.

1920年，列强承诺让他们成为一个独立的国家。

The officers promise a return to multiparty rule.

这些官员承诺恢复多党统治。

诺言；承诺；保证

If you make a promise, you should keep it.

如果做出了承诺，就应该遵守。

The program has lived up to its promise to promote family welfare.

这个项目恪守了其改善家庭福利的承诺。

2、persistent

（尤指不好或不受欢迎的状态或情况）持续存在的，继续发生的

Her position as national leader has been weakened by persistent fears of another coup attempt.

由于人们一直担心会再次发生政变,她的国家领导人地位被削弱了。

His cough grew more persistent until it never stopped.

他咳嗽持续的时间越来越长,直到咳个不停。

执著的；不屈不挠的；锲而不舍的

a persistent critic of the government's transport policies.

对政府交通政策一直持批评态度的人

He phoned again this morning. He's very persistent.

今天早晨他又打来了电话。他非常执著。