need or use great effort;be strenuous;moil ;

I had some difficulty at first recalling why we were there.
刚开始回想我们为什么会在那儿时我有些费劲。
来源:《柯林斯高阶英汉双解学习词典》One in five young adults was struggling with everyday mathematics.
1/5的年轻人做日常的数学计算都费劲。
来源:《柯林斯高阶英汉双解学习词典》Arnold had his head down, gasping as he toiled up the hill.
阿诺德垂着头,一边费劲地往山上爬一边气喘吁吁。
来源:《柯林斯高阶英汉双解学习词典》
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