They found a big question mark on the back of a painting.
她们在一幅画的背面发现了一个巨大的问号。
There's still a big question mark hanging over his future with the team.
他在队中的前途还是个大问号。
there is a big challenge, a big question to answer.
这就有个很大的挑战，很重大的问题需要回答。
Over to you now. It's a big question, I know... but do you feel happy?
现在轮到你了，这是一个大问题，我知道……但是你感到幸福吗？
"That's a big question," he said.
“那是一个大问题，”他说。
Yang Lan: Wow, that's a big question.
杨澜：哇，这是个大问题。
这是个很大的问题。
That's a big question, and I don't have a pat answer.
这确实是个问题，我自己也没有很好的答案。
This is a big question, and I don't have a single answer for everyone.
这是个大问题，我没有一个对任何人都适用的简单答案。
"There is a big question mark about him at the moment," said Wenger.
“现在对于他来说还存在很大的疑问，”温格说。
It's a big question: how trustworthy is the software I use on my computer?
我们电脑里边使用的软件是否值得信赖？
Fireworks are popular all over the world, but there is a big question about their safety.
焰火在全世界都很流行，但是它们却存在严重的安全隐患。
A big question swirls around the origin of that water: Where is it coming from?
问题在于水源：这些水从哪里来？
A big question swirls around the origin of that water: Where is it coming from?
问题在于水源：这些水从哪里来？
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