Process synchronization is an emphasis and difficulty in the teaching of operating system course.
在操作系统课程的教学中，进程同步是其中一个重点，也是难点。
Of course, part of the challenge is her admitted difficulty with acting in English.
当然，一部分挑战是她自己承认的用英语表演的困难。
It's a matter of course that we help a friend in difficulty.
我们帮助有困难的朋友是当然之事。
It's a matter of course that we help a friend in difficulty.
我们帮助有困难的朋友是当然之事。
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