The researchers are not sure, though, whether unhappiness leads to more television-watching or more viewing leads to unhappiness.

但目前研究人员还不确定究竟是不快乐导致人们更爱看电视，还是看电视过多导致人们不快乐。

youdao

Republican Congressman Jeff Flake said at the news conference he supports opening up to Cuba even though he is not sure how its government would react.

VOA: standard.2009.05.06

We're honestly not so sure, though: Apple always tells investors that it's confident in how its products are priced but responsive to market changes, and it's not like a smaller price cut boosted the Apple TV into hit product territory.

ENGADGET: Analyst: Apple to be 'nimble' on iPad pricing, athletic on pommel horse

Share to all the usual suspects in social media, though not sure about Pinterest.

FORBES: 8 Food Apps To Chew On

I'm not quite sure what it is though, apart from a terrible start to the second day of her campaign to become the Socialist Party's candidate for president.

BBC: Segolene Royal