内存开销非常小：基本上每个接口需要额外4个字节（对象实例数据里虚函数表指针），加上引用计数的4个字节。
Overhead in memory is very small: You basically have a 4- byte overhead per interface (the vtable pointers in the object's instance data) plus 4 bytes for the reference counter.
上述各种问题在美国也很常见：美国各高校里分数虚高问题频频发生；哪儿可以上网，哪儿就会有抄袭剽窃现象，而且愈演愈烈。
Some of this is standard fare: American universities suffer periodic spasms over grade inflation; plagiarism is on the rise wherever students can use the internet.
我觉得这张相片里我的脸有点虚。
有(存在)知识在虚的世界里吗？
下周里，你准备做哪一件事来对付这个虚谎？
What one thing will you do in the next week to address this lie?
满脸泥垢的她看起来像《绿野仙踪》里的芒虚金。“你去一趟办公室。”
Her face was lined with dirt that gave her the appearance of one of those munchkins from the Wizard of Oz.
满脸泥垢的她看起来像《绿野仙踪》里的芒虚金。“你去一趟办公室。”
Her face was lined with dirt that gave her the appearance of one of those munchkins from the Wizard of Oz.
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