You must explain this clearly in training or information you provide to your employees. You may advise passengers that your personnel are not required to provide such services.
承运人应该在对员工的培训或信息中清楚表达，你可以告诉旅客承运人员工并无责任提供这类服务。
If I'd done it at the right time, yes: but now that there's been a delay I think you must explain that I'd asked you to tell her at the Opera, before our speaking about it to everybody here.
不过现在已经晚了，我想你必须向她说明，我在看歌剧时曾经让你告诉她，那可是我们在这儿告诉大家之前呀。
Sometimes, you must be able to understand what is written and explain the meaning of them.
有时，你一定要能够理解所写的内容并解释其含义。
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