If the parting line cannot be on a single plane, then it is good practice to use symmetry of the design to minimize the side thrust forces.
如果分模面不能在单一平面，利用设计的对称性来减小侧向推力不失为一种好方法。
The railway tracks join up into a single line on the other side of the town.
在城镇那边的几条铁道合为一条单线。
Digital transformer differential protection may falsely take effective when external single-phase earth fault occurs at star side or the line endures lightning strike on single phase.
数字式变压器差动保护在星形侧发生外部单相接地或线路单相遭雷击的情况下，差动保护有时会误动。
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