MathML在这里扮演一个明显的角色，即充当zip容器中原生的文件格式，或者作为不同系统之间的协作层。
MathML has an obvious role to play here, either as the native file format within the zip container or as an interoperability layer between different systems.
反对在芝加哥设立赌场的特别工作组的菲尔•布莱克威尔（Phil Blackwell）对监管费用和腐化的潜势表示担心：“城市应该充当服务和保护人民的角色，而不是扮演一个商人。”
The regulatory cost and the potential for corruption worries the Reverend Phil Blackwell, of the Taskforce to Oppose Gambling in Chicago. “The city should serve and protect, not be a dealer,” he says.
切班一直扮演天行者，直到年事已高，他退休后还继续教学徒们如何扮演这个角色，并在幕后充当帮手。
Becann played the role until he eventually became too old, and even after retirement continued teaching younger students the part and helping out behind-the-scenes.
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