It's always hard to speculate about the future.

推测未来总是很难的。

《柯林斯英汉双解大词典》

It's tempting to speculate about what might have happened.

大家不禁猜测，到底发生了什么事。

《牛津词典》

People speculate about virtuality systems, but we're already working on it.

人们对虚拟系统尚存疑虑，而我们已经在开发了。

《柯林斯英汉双解大词典》

One of the things you kind of speculate about, and wonder about, why did some cities send out lots of colonies, some cities send out only a few, and others none at all for quite a while.

也许你感到疑惑的一件事是,为什么有些母邦派出了大量移民,另一些只有一些移民,还有其他母邦在很长时间根本没向外移民呢

耶鲁公开课 - 古希腊历史简介课程节选

We can speculate about the causes, but it's impossible to give a single definitive answer.

BBC: Why do the Italians live longer than us?

Once you know where the site is, you can speculate about cures and strategies for therapy.

BBC: Eye disorder secret uncovered

We could certainly speculate about my buried motive a reluctance to leave Vienna, move on, grow up.

WSJ: Teddy Wayne on Locking Himself Up in Vienna |Traveler's Tale