| 单词 | 并且缺乏自信 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔drop behind〕Most of the children were of above average intelligence but had dropped behind academically and lacked confidence.大多数的孩子智力高于平均水平, 但是他们在学习上落后, 并且缺乏自信。外研社新世纪 |
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