An occasional short ride is unlikely to cause trouble.
偶尔一次短途骑车不大可能造成麻烦。
True knot and torsion of cord are cause by occasional factors and difficult to prevent.
脐带异常中脐带真结节、扭转均属偶然因素，难以预防。
True knot and torsion of cord are cause by occasional factors and difficult to prevent.
脐带异常中脐带真结节、扭转均属偶然因素，难以预防。
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