您要查找的是不是：
- Males must be kept separately. 因此雄鱼必须单独饲养。
- Raw meat must be kept separate from cooked meat. 生肉和熟肉必须分开存放。
- Whatever is said here must be kept secret. 这里说的话必须保密。
- The rabble must be kept in a short leash. 对这种下等人必须严加约束。
- These plans must be kept secret from the enemy. 这些计划必须对敌人保密。
- The message must be kept clear and simple. 内容必须简洁而准确。
- A laboratory must be kept in good order. 实验室里必须保持井井有条。
- The fractured leg must be kept in plaster. 必须把骨折的腿打上石膏。
- The room must be kept air by opening the window. 房间必须打开窗户保持通气。
- This arrangement must be kept confidential. 这个安排必须保密。
- All dogs must be kept on a leash in public places. 在公共场所所有的狗必须用皮带牵住。
- All exits must be kept clear of baggage. 所有出口必须保持通畅，不得堆放行李。
- Dogs must be kept on a lead in the park. 狗在公园里必须系着牵狗带。
- Everything must be kept in order. 一切都应安排得整整齐齐。
- Trade secrets must be kept secret. 商业秘密必需保密。
- Our hearts must be kept open, soft and tender. 我们的心必须宽大，温柔，慈爱。
- Our classroom must be kept clean and tidy. 我们教室一定要保持干净整洁。
- The effects of jet detachment must be kept in mind. 喷气流分离的影响要牢牢记
- The food must be kept at a low temperature. 这食物必须在低温下保存。
- Meat must be kept in a cool place. 肉类必须放在凉快的地方保存。
