In order to attract the rabbit's own stem cells to re-grow the cartilage, channels in the scaffold were filled with a growth factor protein.

VOA: standard.2010.08.11

The family left Russia in 1919. So, the revolution, I think, starts in 1917. And things are quite complex in those early days, so there's more than one anti-czarist factor.

他们在1919年乘飞机离开的，改革，应该始于1917年，早期的时候非常复杂,不止是因为反对沙皇。

耶鲁公开课 - 1945年后的美国小说课程节选

And the fact that all of our visas are fingerprint,bio-metric fingerprints based on ensuring that that person's identity is proven is a very important factor in this,".

VOA: standard.2009.12.28