维持保证金（Maintenance Margins）：当约期交付的货物左券价格发发生变故动造成保证金成数不足时所需补缴之金额。约期交付的货物生意业务术语。
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Product revenues took a hit in Q2 due to seasonality and macro-economic factors, but hardware maintenance contracts showed robust growth and is likely to positively impact margins.
FORBES: NetApp Pre-Earnings: Looking For A Sustained Recovery
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