Conclusion Byuse complete marrow direct culture method and density gradient method, after 3 ~ 5 passages, relative purified BMSCs can be obtained.
结论采用全骨髓直接培养及密度梯度离心法，经3 ~ 5代培养后均可获得相对纯化之骨髓间充质干细胞。
In longer cloze passages (paragraphs with missing words to complete), read at least 5 lines without completing anything in order to get clues from the context.
在做长篇完形填空的时候，至少先阅读5行文章，从中找线索。
They climb up through 150 stairways or ride 19 escalators and then walk along the 17. 5 miles of passages to get into their own offices.
他们从150条楼梯或19条自动扶梯上楼，然后沿着17.5英里长的走廊走进自己的办公室。
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