通过滴水的龙头，扬声器或镭射来产生波！增加第二来源或者两条缝，可以产生干涉形式。
Make waves with a dripping faucet, audio speaker, or laser! Add a second source or a pair of slits to create an interference pattern.
要使采购活动成本最低，成为企业利润的第二来源，电子采购是实现这个目标的最佳方案。
How to get the lowest costs in the procurement scheme, how to become the second profit source of enterprise, electronic procurement scheme is the optimum one to achieve this goal.
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