underachieving
[ˌʌndərə'tʃi:vɪŋ]
v.
学习成绩不良，未能发挥学习潜能（underachieve的现在分词形式）;
例句:
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He is always having a dig at underachieving students.
他总挖苦成绩差的学生.
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This paper discusses the approach helps to transform underachieving students.
本文论述接近学困生有助于做好转化工作.
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But today's study says white class boys are most risk of underachieving.
但今天的这份报告指出,兰领白人男孩多数容易成绩不良.
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Underachieving gifted children may do so for many reasons.
来自SA
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Supergroups, however, have a nasty habit of underachieving.
来自BBC
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In my experience underachieving teenagers are likely to rebel at any such such suggestions.
来自SA