Bone marrow stem cells are supposed to home in on damaged parts of the heart. Once there, they send out signals that help the body repair the injury. There's also evidence, from animal studies, that the stem cells themselves engraft to the heart and help repopulate dead cells with new, living cells.
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Once there was a girl 曾经有一个女孩 ; 一旦有了一个女童
Once there was a man 曾经有一个男人
once there was a time 那时候 ; 曾经有过一段时间
Once there was no money 一旦没有钱 ; 曾经没有钱 ; 一旦没有金钱
Once there was a house 曾经有一个房子
Once there were green fields 曾经我在那块绿野上
I went at once there 我立刻就到那里去了
And I was once there 我一度深陷低谷
Once there were regularly scheduled airlines, it became impractical to make a business trip by ocean liner.
一旦有了定期的飞机航班,乘坐远洋客轮出差就变得不切实际了。
从前,那里住着一个皇帝。
Once there were 70 million buffalo on the plains.
在这片平原上曾经生活着7000万头水牛。
There is literally concrete evidence of their work." Tony Hawk says skateboarding was once a sport on the edge of society.
VOA: special.2009.09.11
Disappointment number two, once there is a legitimate government based on consent, the only limits for Locke are limits on arbitrary takings of life or of liberty or of property.
失望的第二点,一旦经过同意建立合法政府后,对洛克来说它唯一的限制,就是不能肆意夺取生命或自由或财产。
But once the financial crisis hit, things changed a little bit, and so there is more competition.
但一旦金融危机爆发了,情况稍微有所改变,因此竞争就会更激烈了。
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