它们的发展是“缓慢的”，原因是发展过程总会伴随着挫折。
They are "slow" in their unfolding, and they are slow because they come with setbacks.
许多机构懂得，OSS实际上不是免费的，因为实现OSS的过程伴随许多其它费用。
Many institutions understand that OSS is not actually free as there are many other associated costs with implementing OSS.
第二种机制是一个渐进的适应性变异过程，在这一过程中，伴随人类受到感染，病毒与人体细胞相结合的能力增加了。
The second mechanism is a more gradual process of adaptive mutation, whereby the capability of the virus to bind to human cells increases during subsequent infections of humans.
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