發送短信 : Pragmatic strategies for variability management in software product lines

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|  __ \\    / _ \\  | || | ||  |  ___|| | || | || 
| |  \ ||  / //\ \\ | '--' ||  | ||__   | || | || 
| |__/ || |  ___  ||| .--. ||  | ||__   | \\_/ || 
|_____//  |_||  |_|||_|| |_||  |_____||  \____//  
 -----`   `-`   `-` `-`  `-`   `-----`    `---`