Conclusion: SDF-1 can keep survival and proliferation course of HL-60 cell at certain level.
结论：SDF - 1可在一定程度上维持HL - 60细胞的存活及增殖进程。
At present, one of the criteria in talent is whether they have certain computer level.
当前对人才的衡量标准之一是其是否具有一定的计算机水平。
If I remain in good health, I know I can play at a certain high level.
如果我保持身体健康，我知道我能发挥很高的水平。
Should donors be given something in return for giving at a certain level?
如果捐助者给予一定层次的东西在返回给什么？
Should donors be given something in return for giving at a certain level?
如果捐助者给予一定层次的东西在返回给什么？
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