The problem is that although such enzymes exist, they are expensive.
但问题在于这样的混合酶尽管存在，成本却太高。
Thee problem is that these phrases do not exist.
但问题是这些短语并不存在。
It is analysis that the problem of misfire exist in some blasting area.
分析认为部分爆区存在拒爆问题。
Useful if you know a problem doesn't exist in that function.
有用的，如果你知道一个问题，不存在该功能。
We are discussing a problem that should not exist in the first place!
我们在讨论一个本来不是问题的问题。
We are discussing a problem that should not exist in the first place!
我们在讨论一个本来不是问题的问题。
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