if i == 0: return ''
Beautiful design and colors: The 13-inch MacBook Air provides the ultimate in portability for users on the go, while the 15-inch model offers even more screen real estate for multitasking. Both models feature a thin, light, and completely silent fanless design that’s available in four gorgeous colors: sky blue, midnight, starlight, and silver.
，这一点在heLLoword翻译官方下载中也有详细论述
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BPatterns provide a fluent, Smalltalk-native API on top of the rewrite engine, using ordinary Smalltalk blocks as patterns.