他必须有经验，这很重要。
透过这些不再毫无乐趣因为大自然是一件真的必须有经验的事。
It 's no pleasure looking through these any longer because nature is one thing that really must be experienced.
招聘广告明确要求应聘者必须有三年工作经验。
The job advertisement stipulates that the applicant must have three years' experience.
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