Few of us wish to turn the clock back, but perhaps we need to remind ourselves how useful the right obstacles can be.

很少有人希望时光倒流，但或许我们需要提醒自己，适当的障碍是多么有用。

youdao

youdao

And, perhaps, similar to sails, they make a useful backup for when the lights go out.

也许，和帆船一样，它们在熄灯的时候可以作为有用的备用品。

youdao

And the last is perhaps the most useful at least at first glance.

还有GetString，最后一个用处最大。

哈佛公开课 - 计算机科学课程节选

Besides, there were more interesting and perhaps useful ways to serve, including through his magazine, George, which he felt could help make public service seem glamorous again, and his charity work.

CNN: ASIANOW - TIME Asia | To Our Readers: A Legacy of Public Service

Such a move would be a shock to Arab states but, perhaps, a useful one.

FORBES: Fact and Comment

Perhaps the most useful comparison, however, is offered by the Republic of Ireland, which gave inmates of its jails the right to participate in elections for the first time in 2006.

BBC: Would prisoners use their right to vote?