Search engine marketing is the single most important Ecommerce expenditure, yet for most businesses, it is also the most opaque.
搜索引擎营销是电子商务的一个最重要的支出，但对大多数企业，它也是最不透明的。
Search engine marketing is the single most important Ecommerce expenditure, yet for most businesses, it is also the most opaque.
搜索引擎营销是电子商务的一个最重要的支出，但对大多数企业，它也是最不透明的。
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