I believe it is useful to look at what lies behind this achievement and what it promises for the future.

我认为，了解促成这种成就的因素以及对今后的影响将是有用的。

youdao

I believe IT pros experienced in the area in which they are testing do not (although a course is always useful).

我认为在需要进行认证的领域有丰富经验的IT专业人员没有必要参加(尽管参加这些课程十分有用)。

youdao

While it is true that some advertisements do provide useful information about new products, I believe that their primary effect is to encourage people to buy things that they don't really need.

虽然某些广告的确提供了关于新产品的有用资讯，但我认为，它们的主要功用就是鼓励大家去买一些不是真的很需要的东西。

youdao

If I write stuff that I believe will be useful, and write it as clearly and engagingly as I know how, that gives me the best odds of reaching lots of people.

FORBES: How I Wrote Yesterday's Most-Viewed Post on Forbes (Hint: I Don't Know)

Most people consider the Kindle Fire HD a consumer device and it largely is, but I believe it makes a sweet, useful tablet for startups and small businesses.

FORBES: Kindle Fire HD Best Selling Product From Amazon

Though I cannot discuss details in an open setting, as a member of the Senate Intelligence Committee, I can tell you that before Operation Iraqi Freedom we had very little human intelligence in Iraq, and, therefore, the INC provided one of the best--and only--avenues for acquiring intelligence on Saddam Hussein's regime.12 I believe the Department of Defense would conclude it was useful.

CENTERFORSECURITYPOLICY: Center For Security Policy