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内存扩充卡是计算机很有用的附件。用英语怎么说？

内存扩充卡是计算机很有用的附件。

The memory expansion cards are useful adjuncts to the computer.

相关词汇
the memory expansion cards are useful adjuncts to computer

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

memory

n. 记忆，记忆力，回忆，往事，[计]存储器，内存；

expansion

n. 扩大，扩张，扩张物，膨胀物；

cards

n. 卡（ card的名词复数 ），纸牌，贺卡，信用卡；

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

useful

adj. 有用的，有益的，有帮助的，令人满意的；

adjuncts

n. 附件，助手( adjunct的名词复数 )；

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

computer

n. （电子）计算机，电脑；
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