类似地，T{}只是"产生"可能不完整值的表达式的一个例子——我们称这类表达式为上游操作符：
Harmon concluded a memorable career by setting school records for assists and steals, emblematic of Texas’ resurgence. As a freshman, she helped secure the Big 12 tournament title for the first time since 2003; now in the SEC, Texas advances to its second straight Final Four. In the Fort Worth Regional 3, she posted 11 points, seven rebounds, seven assists, and six steals against Kentucky, then tied an Elite Eight record with 13 assists versus Michigan. In November’s win over UCLA, she led with 26 points and five assists. -- Voepel
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UPDATE: See 'dd' entry for cp's remarkable capabilities!
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