预防性使用能及时保护发动机，这是由于磨损降低和润滑性改善，以减少机械损伤。
Precautious use can protect the engine in time from mechanical damage due to reduction of wear and tear and improvement in lubrication.
城镇居民家庭的预防性储蓄动机要大于农村居民家庭的预防性储蓄动机；
The precautionary motivation of urban resident household is stronger than the rural resident household.
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