| 单词 | required |
| 释义 | Word Frequency required(rɪˈkwaɪəd) adjective 1. essential, needed, or necessary failure to maintain the required level of security 2. set out by rule; compulsory Check that the machines meet required standards. Parliamentary approval is required for any scheme. What qualifications are required? Rear seatbelts are now required by law. |
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