He works for us on an occasional basis.
他在我们这里做临时工。
These managers also will be responsible for auditing each of the sites, supported by outside expertise on an occasional basis.
这些管理者也将在外单位专家的协助下随机的对每个点数据进行审核。
Many health professionals deal with issues of child protection on a regular or occasional basis, so they not only need a good understanding of their duties but also an awareness of cultural issues.
许多保健专业人员处理儿童保护问题上的定期或不定期的基础，所以他们不仅需要很好地理解其职责，而且还认识到文化问题。
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