Living activities at different levels of demand, when demand for low-level are met, the tenants will be put forward higher requirements.
居住活动的需求是分层次的，当低层次的需求的得到满足后，住户才会提出更高的要求。
Users of construction machinery are now increasingly demanding high quality, to put forward higher requirements for hydraulic pumps.
现在用户对工程机械质量的要求越来越高，对液压泵提出了更高的要求。
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