"be on a roll" is an informal idiom.
According to Oxford Advanced Learner's Dictionary, it means
"to be experiencing a period of success at what you are doing."
其實我之前提供的那個freedicitionary，也可以查到這個片語。
http://www.thefreedictionary.com/Dictionary.htm
你可以上去找找。
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i am sam.
http://blog.yam.com/freisam
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