With any controlled vocabulary, choosing the granularity for each level of the tagging hierarchy is a critical decision for both maintenance and information navigation.
对于任何控制词汇，为每个级别的标记层次选择正确的粒度对于维护和信息导航来说都是一个关键决策。
2
The fan running is intelligently controlled to ensure the engines in cold areas would not be too cold, reduce engine wear, decrease the maintenance fees and extend the service life.
智能控制风扇运转，保证在寒冷地区发动机不会过冷，可减少发动机磨损，降低保养费用并延长使用寿命。
3
Adopting air-controlled positioning, noiseless and easy for maintenance.