high-grade road maintainance 高等级公路养护
Gene conversion may be the reason of maintainance of high level homology between SLG and SRK.
基因转换可能是SLG和SRK的高度同源性能够得以保持的原因。
The maintainance of high power vacuum tube and the prolongation of its service life play an important role in the steady, safety and reliable operation of TV transmitter and in saving of money.
维护大功率电子管和延长其使用寿命，对保障电视发射机稳定、安全、可靠地工作和节约资金都起着重要作用。
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