without fail

释义：“必定”，形容某事在一个确定的时间区间内注定会发生，可以在留学文书里用来修饰自己的一种长期坚持的好习惯。

例句：
He'd been doing it without fail since the day we met nearly three months ago.
I get cards and flowers, never on a schedule, but without fail once or twice a year.