报道说，此前，北极熊和灰熊曾在动物园内被配对成功，而且它们还生下了后代。 北极熊和灰熊这两种不同种类的熊，其繁殖期大致相同，但相比较而言，北极熊的繁殖期要比灰熊来得稍稍早一些。
Stirling said polar bears and grizzlies have been successfully paired in zoos and that their offspring are fertile, but there had been no documented case in the wild.
春天是它们的发情期，夜间啼血般地叫个不住，是召唤‘婚配对象’哩！
Spring is their estrus, the sound all time in night like crow blood is for beckoning their 'Mating objects'.
双线期时，配对的染色单体开始从四分体中分离，此时常可见染色体交叉。
In diplotene the pairs of chromatids begin to separate from the tetrad formed by the association of homologous chromosomes.
偶线期时，以同源染色体活跃的、特定的配对(联会)为特征，形成了单倍数的二价染色体。
Synapsis (pairing) the association of homologous chromosomes during the prophase stage of meiosis that leads to the production of a haploid number of bivalents.
研究PAF发作与窦性心室率、前5分钟窦性心律的心率变异、房性期前收缩及其配对间期的关系。
The study was focused on heart rate(HR) variation of sinus rhythm before 5 minutes attacking, relationship between premature atrial contraction, coupling interval and PAF episodes.
母血配对检查结果，妊娠期PRL值自早孕开始随孕月增加而升高，妊娠足月时可达非孕妇女17倍；
The results indicated that the serum PRL raised steadily during the pregnancy and reached the peak at term with a 17-fold increase.
母血配对检查结果，妊娠期PRL值自早孕开始随孕月增加而升高，妊娠足月时可达非孕妇女17倍；
The results indicated that the serum PRL raised steadily during the pregnancy and reached the peak at term with a 17-fold increase.
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