看看这两个till的含义(开车前的水冲洗)? hose connect filtered water from utility stations to v-xx. flush d-1234 from the reflux line and drain at v-xxx till the drain water is clean. check if the instruments can gave realistic values. check collector and distributor in the column; make sure there is no operation and drain problem. then close water supply, drains and all manholes till the drain water is clean. 根据上面的理解,我就发表一下个人译文,基本上赞同clauspolunit: 从公用工程站接软管引已过滤水至v-xx,直到排水变洁净为止,从v-xxx上的回流线和排水口冲洗 d-1234。检查仪表是否能给出实际值。检查塔内的积液槽和分布器并确认无操作和排液问题,待排出的水为清洁水时,然后依次关闭上水、排水和人孔。 注意,原文中一直在使用till,而不是until查看更多