Card marking algorithms can add as little as two or three machine instructions per non-initializing heap pointer store, and entails scanning any objects on dirty CARDS at minor collection time.

对每一个非初始化堆指针存储，卡片标记算法可以只增加两到三个机器指令，并要求在小的收集时对所有脏卡片上的对象进行扫描。

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There are several costs to card marking - additional space for the card map, additional work to be done on each pointer store, and additional work to be done at garbage collection time.

卡片标记有几项开销——卡片映射所需的额外空间、对每一个指针存储所做的额外工作，以及在垃圾收集时做的额外工作。

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Besides, the marking medium is paper, which can't be easily replicated and transported, and it is difficult to store and transport.

阅卷工作的介质是纸质试卷，不方便进行复制和远距离运输，使得试卷的保管和运送工作变得复杂。

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U.S. same-store sales were down 1.3% year-over-year, marking the sixth sequential quarterly decline.

FORBES: Wal-Mart Chugs To $70 On U.S. Growth Alone