Life is filled with coincidence, two parallel lines will also cross on someday.
向左走向右走：生命中充满了巧合，两条平行线也会有相交的一天。
The most common designs in clinical trial are parallel design and cross over design.
临床试验中最常见的设计是平行组设计和交叉设计。
Can stand finally at two parallel on-line mutual on guard never once cross however!
最后只能站在两条平行线上互相守望却从不曾交错！
Can stand finally at two parallel on-line mutual on guard never once cross however!
最后只能站在两条平行线上互相守望却从不曾交错！
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