必须保持的英文

• mandatory retention

• 必须:    must; have to; be obliged to ...
• 保持:    keep; hold; retain; maintain ...
• 但是我必须保持这权利:    but he just kept right on
• 你必须保持衣着整洁:    you must keyour clothes clean
• 事前必须保持湿湿脚:    get your feet wet

例句与用法

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。