Of course, this is a big problem.
那是当然。这可是个大问题。
I think this is a big problem - much bigger than we think.
我认为这是一个大问题，比我们想得还要大。
这是个大问题。
This is a big problem that looks destined to grow even bigger.
这是一个注定要变得更为严重的大问题。
This is a big problem people are concerning.
这是许多人关心的一个重大问题。
This is a big problem, because it gives off irritating or toxic fumes.
这是一个大问题，因为它散发出刺激性或有毒烟雾。
This is a big problem, because it gives off irritating or toxic fumes.
这是一个大问题，因为它散发出刺激性或有毒烟雾。
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