Example: At the time of writing, a special promotion gives you a voucher to save $75 USD on an exam when you buy an approved certification study book.
例如，在撰写本文时，IBM 举办的特价促销活动会发放一些优惠券，只要您购买某本权威认证书籍，就可以为考试节省 $75美元。
Example: At the time of writing, a special promotion gives you a voucher to save $75 USD on an exam when you buy an approved certification study book.
例如，在撰写本文时，IBM 举办的特价促销活动会发放一些优惠券，只要您购买某本权威认证书籍，就可以为考试节省 $75美元。
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