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Expression
掉链子diào liàn zi
break down; have problems; go wrong; make mistakes
他平时的学习成绩可好了,但是一到考试他就掉链子。这大概是心理素质不好造成的。
Usually he has good marks, but he always goes wrong in examinations. Perhaps this is caused by a flaw in his psychological make-up.

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