没有本土市场的支撑，没有正规的商业通路，被层层封锁隔绝在全球主流商业生态之外，他们无法通过盈利反哺技术研发，无法实现产品规模化迭代，更不可能构建起可持续的技术生态。这也是伊朗科技发展进程中，让人惋惜的地方。
A single dose of stem cells can help older people with frailty build up their endurance. Plus, how to successfully make a career pivot and what ‘adulthood’ really means.
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Multiple iterations before acceptance
$p$ is the power-law exponent