"C" are unwritten or unavoidable but necessary (administration, travel, personal).
“C”级事项是口头的或者是不可避免的，但确是必须的(管理、旅游，私人事情)。
But he said some technology transfer was unavoidable.
但他说一些技术转让是难免的。
But in this particular case, making a mistake is unavoidable. We should be thoughtful.
但是在这种特殊的情况下出错是难免的。我们应该体谅人。
But even with experience, sometimes a double impact is unavoidable.
但是即使有经验，有时双击也不可避免。
But, much of the contraction is unavoidable and necessary.
但是，相当的收缩是不可避免和必要的。
I agree with you in a sense, but the problem is unavoidable.
在某种意义上我同意，但是问题是不可避免的。
But in this particular case, making a mistake is unavoidable.
但是在这种特殊的情况下出错是难免的。
But speech under real environment is unavoidable to suffer the influence of environment all round.
现实生活中的语音不可避免的要受到周围环境的影响。
They are right, but it is unavoidable, because that's what psychology is.
他们说的对，但这无可避免，因为这就是心理学。
They are right, but it is unavoidable, because that's what psychology is.
他们说的对，但这无可避免，因为这就是心理学。
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