必须保持的英文

mandatory retention

• 必须:    must; have to; be ...
• 保持:    keep; hold; retain ...
• 但是我必须保持这权利:    but he just kept r ...

例句与用法

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1. A laboratory must be kept in good order .
   实验室里必须保持井井有条。
2. Mr. elton must compose his joyous looks .
   厄尔吞先生必须保持他欢乐的神色。
3. The town where she lived had to be kept clean and sweet .
   她住的镇上必须保持清洁、芳香。
4. Ventilation must be ensured .
   必须保持通风。
5. "you must compose yourself," said the doctor, supporting her .
   “你必须保持镇静，”大夫扶着他说。