1.scala組合表達式之嵌套

"C:\Program Files\Java\jdk1.8.0_181\bin\java.exe" "-javaagent:C:\Users\Lenovo\AppData\Roaming\JetBrains\IntelliJ IDEA Community Edition 2018.2.2\lib\idea_rt.jar=60589:C:\Users\Lenovo\AppData\Roaming\J

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