The service design is usually a secondary activity, although it is sometimes done in parallel.
服务设计常常是次要的活动，尽管有时候并行地完成。
However, sometimes it will happen that all the planes are parallel to the same direction.
然而有时，所有平面都与同一个方向平行。
However, sometimes it will happen that all the planes are parallel to the same direction.
然而有时，所有平面都与同一个方向平行。
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