A credit card is very useful when you go traveling.
当然旅游的时候，信用卡很有用。
疯狂英语 900 句
谈个人理财
📚 句中词汇解析
从本句中提取的重要词汇
n. 信誉，信用;[金融]贷款;荣誉;学分;
vt. 相信，信任;归功于;[会]记入贷方;赞颂;
💡 cred相信，信任+it表名词 → 信任；学分
"Chip and PIN is designed to combat credit card fraud."
智能卡系统是专为防止信用卡诈骗设计的。
近义：loan, ascribe, assign, attribute, accredit, accommodation
反义：invoice, bill, charge, expense
adj. 有用的，有益的，有帮助的;令人满意的;
💡 use用+ful可…的” →有用的
"The memory expansion cards are useful adjuncts to the computer."
内存扩充卡是计算机很有用的附件。
近义：helpful, assistive, available, profitable, purposive, serviceable
反义：idle, inane, ineffective, insignificant, lousy, needless