a marketing campaign的用法和样例：
- There are two basic methods for tracking a marketing campaign.
- I need to get a purchase order for a marketing campaign.
- Regional gangs then began a marketing campaign to unload large quantities of drugs.
- By keeping track of the responses that you get to a marketing campaign and understanding what prompted those responses, you can identify which tactics succeeded and which did not.
- But My American Jobs has yet to run a marketing campaign to familiarise buyers with its insignia; there is no point, if no such goods are available yet.