Under base employ of the coated urea, the total N concentration of farm surface water was near the contract level, and the possibility via runoff was very little.

结果表明，包膜尿素在基施情况下，田面水总氮浓度始终接近对照水平，通过径流损失的可能性很小。

youdao

Some services are sometimes provided under contract or service level agreement with a local authority in pursuit of its statutory duties towards children.

BBC: Education Committee

By playing in his sixth NHL game, the 18-year-old's entry-level professional contract officially began and he is no longer eligible to return to the Quebec Remparts of the Quebec junior league.

WSJ: Frattin lifts Maple Leafs over Sabres 4-3 in OT

Dr Willie Black, chairman of the organisation that represents European top-level domains and managing director of Nominet, said fear of a lawsuit was preventing Icann from signing a contract to provide a given level of service.

BBC: Net's servers under scrutiny