promise用法搭配.then 同步执行

promise例句：

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。

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。

If you make a promise, you should keep it.

如果做出了承诺，就应该遵守。

While it will be fun, the seminar also promises to be most instructive.

这次的研讨会不仅会有趣，而且有可能会颇具启发意义。

The boy first showed promise as an athlete in grade school.

这个男孩在上小学的时候就初次显示出成为运动员的'潜力。

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。

Promise me you will not waste your time.

答应我，不要浪费自己的时间。

We'll be back next year, he promised.

“我们明年会回来的，”他承诺道。