| 释义 |
enns r.
- ensurevt. 保证，确保；使安全
- encirclevt. 环绕；围绕；包围
- insurevt. 确保，保证；给…保险 vi. 确保；投保
- 读、写、算dú _ xiě _ suàn
the three R's
- 每分钟转数měi fèn zhōng zhuǎn shù
revolutions per minute (r/m)
- 阴极射线管yīn jí shè xiàn guǎn
cathode-ray tube (CRT); cathode-ray lamp; C-R tube
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