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.

youdao

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.

youdao

有(存在)知识在虚的世界里吗？

Is there an episteme in virtual worlds?

youdao

有(存在)知识在虚的世界里吗？

Is there an episteme in virtual worlds?

youdao