名词中文翻译
中文翻译：不熟练
同义词：
['inefficiency', 'ineptitude', "lack of skill例句：1. The student's improficiency in math is holding up the class.（学生的数学不熟练阻碍了班级的学习。）2. The teacher noticed that the student was not proficient in English.（老师注意到学生在英语方面不熟练。）"]
例句：
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1. The student's improficiency in math is holding up the class.
学生的数学不熟练阻碍了班级的学习。
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2. The teacher noticed that the student was not proficient in English.
老师注意到学生在英语方面不熟练。
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3.The engineer found that the machine was lacking in efficiency.
工程师发现机器效率低下。