| 1. | Methods Petal's organ development, fetal position, condition of placeta and amnion in general prenengcy underwent color ultrasound examination at the same time. If there was cord entanglement in neck and cycle number of wrapping were observed. |
| 彩超常规检查足月妊娠孕妇胎儿各器官发育及胎儿方位、胎盘、羊水等情况,同时观察是否有脐带绕颈及绕颈周数。 |
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| 2. | Another limitation of umbilical cord blood is the relatively small number of stem cells contained within a single sample. |
| 脐带血的另一限制，是单一样本中所含的干细胞相对不多。 |
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| 3. | Threads of added strength are produced by twisting plied yarns in the opposite direction to which they have already been twisted, for example, a cord thread with a left twist is made of a number of ply threads with a right twist. |
| 加固线是把已经捻过的纱线合股朝相反方向加捻。例如：一般朝左捻的粗线是由数股朝右捻的线合纺而成。 |
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